Demon Slayer: Tanjiro's New Family NSFW

*NOTE THE STORY BELOW IS FILLED WITH MANY SEXUAL THEMES AND IMAGERY. ALL CHARACTERS ARE 18+ IN THIS UNIVERSE. PLEASE DO NOT READ IF YOU DON"T LIKE THIS KIND OF STORY. I Will Say Again All Characters Are 18+. Reading Past This Point Means That You Understand This. YOU ALL HAVE BEEN WARNED.*

“Ack, ack. I…I won’t give up,” Tanjiro said barely holding himself up with his sword. The spider demon mother was stronger than he had expected and at this point in time he knew that he was going to lose. Though that didn’t mean that he would give up without a fight.

“Fufufu~. You are quite the strong one indeed~,” Mother said to him eying the poor bloodied, and beaten boy. “If I bring you back then Rui won’t try to kill me. Yes if I do that he’ll be sure to forgive me~!!!” she screamed, eyeing Tanjiro with a deranged look spread across her face.

“I’ll-ack…I’ll kill you,” Tanjiro said, using all of his strength to lift his sword and start on of his techniques.

“Fufufufu~!!! Did you really think that such a pathetic twig could defeat me~!!” Mother yelled, becoming more confident in herself. “Here let me show you the difference~.”

“W-what the hell…why can’t I move!?” Tanjiro screamed; unable to move his body and finish his attack thanks to Mother’s spider threads. She had no intention of letting him go when he was the perfect candidate to become her twin~.

“Don’t worry no harm will come to you,” she said, slowly walking over to the tied-up boy. “Well, at least not from me it won’t~. I can’t guarantee what Rui will do. He’s such a precious child, he just has a bit of a temper and is a bit of a perfectionist~. As long as you do what he tells you to do you can easily be a part of our family.”

“Your family? I would never be a part of your family!” Tanjiro yelled at her, furious that she would even suggest such a thing. The only family for him was Nezuko and that would never change.

“Haahhh!? Do you think that you have the right to deny me!” Mother yelled, knowing that if she came back empty-handed Rui would kill her. This was the only way for her to survive and she wasn’t going to take no for an answer. “Do you a boy of 19 years dare think that he can defy me!? You will join our family and you will come to love your new life. We all did eventually. I’m sure that Rui will like you once we give you a proper form~.”

“What are yo-mmmppphh!!!” Before Tanjiro could say anything else she stuck her tongue straight down his throat, giving him a deep and long kiss before releasing him.

“Fine if you don’t wish to take this as a gift then this shall be your punishment,” she said, coldly looking down at Tanjiro with a cold harsh expression on her face. She would survive and he would enjoy the wonders and hardships of motherhood, along with her.

“What are you talking about!?” Tanjiro yelled at her. “If you plan on killing me then do it already! I won’t let you use me as a toy!”

“Tsk, tsk, tsk. I already told you that you would become a part of our family~,” Mother said back to Tanjiro. “Come on, don’t tell me that you don’t want to be a part of our family.”

“I already have a family and Nezuko is all I need to be happy!” Tanjiro yelled ta her. “You can never replace her!”

“Hmm, you mean the little demon girl in the box. She is a cute one~,” Mother said to herself, thinking of another plan. Though that one would have to wait until she was done dealing with this disobedient young man.

“Wait! What do you plan on doing with Nezuko!?” Tanjiro yelled at her, struggling to free himself, but her spider threads were far too strong for him to break. There was nothing that he could do, he was powerless! “I’ll kill you if you touch her!”

“Fufufu~. It’s not what I have planned that you should be scared of. It’s what Rui desires that you should fear~,” she said, giving him a creepy smile as her spider threads slowly started to wrap around his body, to help begin Tanjiro’s metamorphosis~.

“Stop! What are you doing!?” Tanjiro yelled struggling as the threads tied his legs up and forced his arms behind his back. “Stop this!”

“Fufufu~. No can do~,” Mother said before embracing him with her body, allowing her spider threads to tie them up together~.

“What are you doing? Stop thi-mmmmmph!” Tanjiro tried to scream for her to let him go, but she was done letting this foolish boy speak. Now that they were fully encased in her threads there was no way that he could run away from her.

Tanjiro was scared and confused. What was she planning to do with him and why the hell did her touch feel so good? It was if something was awaking in him, changing and corrupting his soul! How was she doing this!?

“Oh my, look at him squirm it’s actually quite cute~. It’s a shame that I can’t keep you for myself~” Mother said, giving Tanjiro a second to breathe without her tongue ramming down his throat. “You know have a cute face and personality as well,” she said to herself teasing Tanjiro who couldn’t do anything to stop her in his current state.

“That’s right you like this, don’t you~,” Mother said, teasing the poor young. 19 years old and still a virgin, what a pathetic young man he was. Though after tonight he would no longer be a man~.

“You know that worry that you showed for a sister is an excellent quality in a mother~. I don’t think that I have ever seen a boy like you before. I wonder what your skills in cooking are~? Rui loves eating his meals raw, but he more than eagerly accepts when I cook something up for him~. I know that he’ll love it if you try too as well~.”

“Fuck you! I’ll-mmmph!” Tanjiro’s tried yelling at her once more, but once again she muffled his screams by shoving her tongue down his throat. It was time for the fun to begin.

“Nnnnn~!!!” Tanjiro let out a moan of pleasure as his body began to shrink beneath the spider threads.

“He moaned more and more as his body began to feel like it was on fire! His frame became more feminine as his hair and nails started to grow longer, while his skin began to turn milky white just like Mother’s.

“Nnnnnn~!!!!” Tanjiro moan out again as his chest started to feel more sensitive with each grope Mother gave his once firm chest. His mind started to go numb as multiple red circular face markings appeared on his face.

“Mmm~. Quite tasty, but I think that I want more~,” Mother said, now using both of her hands to grope his chest~.

“Mmmmmmmmmph!” Tanjiro screamed and moaned in horror as a pair of D-cup breasts the same size as Mother’s grew on his chest.

“Pl-please…st-stop…”

Seeing the tears form in his eyes Mother wanted to make him feel even more pleasure. She kissed and slightly bit Tanjiro on his lips, fattening up his lips to be as beautiful as hers! She almost laughed when she saw that Tanjiro’s face was becoming more and more like her own. Her teal eyelashes, black nails, and even her bushy eyebrows donned her face~

“How does it feel, being pleasured by a demon?” Mother asked him, though she already knew that answer thanks to his face turning bright and ready!

“Free me!” Tanjiro yelled as Mother gave him enough room to talk, noticing that his voice sounded just like hers now!

“Why the hell are you doing to me!? Let me go! Let me go!” Tanjiro yelled, knowing that his body was becoming that of a woman, and he knew that if he allowed this to go any further then he would no longer be a man!

“Oh, your poor things, there is no need to cry,” Mother said ignoring his demands, as he was nothing more than her play toy at the moment, whose only purpose was to be shaped by her. “Here, allow me to show you something special~,” she said before miraculously flipping herself around in their spider thread cocoon. “Be sure to savor the taste you naughty boy~”

“Mmmmmmph!” Tanjiro screamed and moaned again as his ass and thighs expanded out to the same size as Mother's. Then as Tanjiro was forced to cum because of Mother’s technique his hair turned white and with one painful and pleasurable moment Tanjiro’s manhood was no more! Tanjiro felt a part of his mind shatter as Mother smiled back at her new twin. His body's corruption was now complete, and it was time to see the fruits of her labor~.

“Fufufu~. It’s time to come out and see the new perfect you,” Mother said unraveling the spider thread around them. “Hmm, I have one somewhere in here~,” she said to herself, looking inside her white kimono. “Ah, here it is~!” she said joyfully, pulling out a small handheld mirror for her to use.

“So, what do you think of the new perfect you~?” she asked, handing the mirror to a dumbstruck Tanjiro

“No… no way,” Tanjiro said, looking at herself in the mirror before looking down at her breasts and new curvaceous physique. It didn’t take her long after that as she began to fondle them as well as her new fat ass to make sure that they were real. With each squeeze waves of pleasure went throughout her new body!

Mother eagerly watched her new twin fondle herself with delight and she had to hold herself back from pleasuring herself as well. Now was not the right time as such activities would be done with their husband.

Tanjiro saw Mother smugly smiling at her, taking her out of the pleasure trance that she put herself in. She had to focus! Tanjiro rose to her feet; she would defeat this demon matter what and breasts or not she would-

“Kyaaaaaa!!!!!” Tanjiro screamed at the top of her lungs in Mother’s seductive voice, realizing that she was practically in her undergarments as Mother began to strip her down while they were in the spider thread cocoon together.

She tried to cover herself with the remains of her clothes, but it wasn’t enough. Tanjiro fell down to the ground and held her knees to her chest, hoping that no one would see her like this.

What if her friends saw her like this? No it would be worse if Nezuko saw her like this. Would she even recognize her in this state? Nezuko would lose all respect for her as her Mother. Wait, Mother? Tanjiro was her big brother, not her Mother. She was starting to become more confused due to her current situation.

“Aww how cute,” Mother said mocking Tanjiro. “Though as a mother being cute is not an option~. We must be firm and mature Don’t you feel it? Doesn’t your body make you feel like a mother now~? Come on you know that you like your new form, no you love it don’t you?” Mother asked Tanjiro, teasing her, having her own fun before they had to return to Rui. “I saw you groping your new motherly tits and fat ass even though you knew that I was here. You couldn’t resist, could you? I mean really, who could?”

“N-no I-I di-didn’t mean to!” Tanjiro yelled, scared of what was becoming of herself. She began stuttering as she could no longer deny what she did or what she was. She fondled herself and got lost in the pleasure of her new form. A form that was not human, the form of a demon. Since Tanjiro was transformed into an exact version of Mother that meant that she was a demon!

“Aww, it looks like someone just realized the truth that they’re a mother and a demon now~. Oh, that expression of absolute despair across your face is quite lovely~. You can feel it can’t you? That sense of being reborn as a beautiful mother demon, and your body overflowing with power! I felt the same way when Rui turned me. While being his mother is quite terrifying, you can’t deny the perks~,” she said, kneeling down and groping Tanjiro’s breasts.

“Nnnnn~!!! N-no! I-I-I’m a human!” Tanjiro yelled at her trying to avoid the truth.

“Are you really? Then how about this?” she said flicking a small amount of human blood she had left over onto Tanjiro’s lips.

“Ahhhhhhhhhhhh!” Tanjiro moaned in pleasure as a wave of pure ecstasy washed over her body. She had tasted only a small amount of human blood and she had felt more alive than when she was a human. How come she had never been able to feel like this before!?

“That’s a good girl,” Mother said to her twin. “Accept the change, there is no use resisting it any longer. Listen to me and everything will turn out fine.”

With that last bit of encouragement, Tanjiro’s mind slowly started to become corrupted just like her body. Her body felt another wave of ecstasy wash over it as she began her awakening.

“Fufufufu~. That’s right~. Now, let’s get you properly dressed to see your new family ~,” Mother said, using her spider threads to create a lengthy, layered kimono — maroon on the inside layer and white on the outside layer before forcing it on Tanjiro who didn’t have the strength to fight back. The kimono exposed part of her chest and was tied with a patterned obi. She was now also donned a beaded necklace composed of teal and purple orbs and decorative anklets. And to make her look exactly like Mother she was forced to be barefoot with the lower front of her kimono open, exposing her legs.

“Hahahahahahahahahahaha!” Mother laughed at the poor former male, now her twin. It was going to be fun watching her become a perfect mother like her~.

“No!!!” Despite her mind, body, and spirit being corrupted by her transformation into a demon she was determined to fight this. If she could escape then perhaps she could find a way to turn herself back into a human. She had to fight!

“I-I…I will fight!” Tanjiro yelled at an intrigued Mother, who was patiently waiting to see what her twin's last desperate act of defiance would be~. Tanjiro quickly grabbed her sword on the ground and charged right at Mother with the intent to kill! Even if she was turned into a demon she would not rest until she was dead.

Though everything went horribly wrong the moment that Tanjiro decided to go against her new twin. In her rage, Tanjiro forgot why she lost to mother in the first place. Before she took even a single step she was already trapped in Mother's webs. Though even still she struggled against her bonds causing her fat tits and fat ass to bounce for Mother to ogle at~.

“Fufufu~. How lovely, such a fighter~,” Mother said getting closer to Tanjiro, caressing her cheek with one hand while her other was used to force Tanjiro to lower her sword. “That’s better~,” she said taking the sword away from her twin.

“It must have been very difficult for you to hold this heavy thing~. You must have felt like you were holding a stick of lead~. Your body is no longer that of a warrior, but that of a mother. There’s no way that you can swing a sword in your current state. Now let me show you what happens to naughty mommies like yourself~,” she said before flipping Tanjiro over and forcing her to stick her ass out into the air!

SMACK! SMACK! SMACK!

“Ahhhhhhh! Stop it !” Tanjiro cried as Mother began to spank her new milky white fat ass!

“What a naughty mother you are,” Mother said, sounding disappointed in Tanjiro. “If you think that this is the punishment you are wrong! This is nothing compared to what Rui will do to you if you disobey.

SMACK! SMACK! SMACK!

“Such a naughty mother needs to be taught a lesson for her own good,” Mother said to Tanjiro, continuing to spank her to get rid of any more unwanted disobedience from her. If you want to live then from now on you will do what I say!”

“No, no, no! I don’t wanna! I don’t wanna!” Tanjiro started screaming, tears flowing out of her eyes and she tried to struggle away from Mother, but the spider threads wouldn’t allow her to run. She never thought that she would be spanked at this age, but here she was, it was utterly humiliating!

“If you don’t shut that little mouth of yours and stop fighting me I will let Rui deal with you’re training instead and he will not be as gentle,” Mother said, threatening Tanjiro. She needed to be properly “reeducated” in the near future to make sure that she would stay alive.

“No, please no!” Tanjiro begged as she stopped struggling and shouting, but she couldn’t help but cry from the pain of Mother’s spankings.

“Good girl,” Mother said before continuing Tanjiro’s spankings.

SMACK! SMACK! SMACK! SMACK! SMACK! SMACK!

“Now let’s get going, the family is waiting for us~,” Mother said forcing Tanjiro to follow her against her will by using her spider threads.

“Ngh,” Tanjiro groaned as she was forcibly brought back to her new home. There Rui, Eldest Sister, and Father were there. It would seem that Eldest Brother failed and kill by a demon slayer, or perhaps Rui himself.

“Mother~!!! You’ve returned ~!!” Rui yelled with childlike innocence, hugging his mother. “Mother I killed the demon slayers that killed big brother~. Did I do I good job~?”

“Yes you did sweetie~,” Mother said to Rui. “My son is the strongest there is~,” she said patting him on the head, a drop of sweat rolled down her forehead as she did. She needed to be careful.

“Hehehehe~. I knew that mother would understand just how great I am~. …But mother when did you ever say about bringing a guest?” Rui asked, noticing that there was another presence nearby, that felt oddly familiar.

“I-I’m sorry Rui, I wanted it to be a s-surprise~,” Mother said, nervously, hoping that she made the correct decision. “Come on out sweetie, it’s time to meet your new family~.” Mother used her powers to force Tanjiro to walk out from where she was hiding, with her mouth tied up with spider threads to keep her from talking.

“Hmm? What’s this? There are two mothers?” Rui said not sounding pleased.

“Rui is such a special and s-sweet child that needs more attention from just one m-mother. She is here to help so that you may get the attention you deserve~.”

“Hmm. I ought to kill you for adding another member to our family without telling me, but I don’t hate this idea,” Rui said to her relief. “In fact, it might be best to say that you did well for once. While I already have in mind who shall become my new sibling, I am more than eager to see if this candidate of yours has what it takes to be a proper mother~. Let her speak~.”

“Y-yes Rui,” Mother said, taking away the threads that kept her from talking.

“You fucking monster what have you done with the other demon slayers! There no way that you killed them all!” Tanjiro yelled at Rui, worried about her friends and Nezuko.

“Quite the mouth on this one~,” Rui said examining his second mother. “Looks are perfect, and she seems to be trainable. Though there is one problem, her attitude.

SMACK!

“You stupid bitch. I don’t have to explain anything to you. So what if I murdered all the demon slayers I saw, or so what if I let a few get away? As my mother, it’s your job to praise and love me. You do ask the questions. Your role is simple. If you think that it’s too hard I could always remold you into a baby. Is that what you want, to be a dumb baby that no one understands~?”

Rui was terrifying. Tanjiro had never seen a demon this powerful before. She was sure that if she fought him while she was still a human she would easily lose. Though she wasn’t going to make this easy for him.

“If you want me to be your mother then you’re asking for a spanking you little shit,” Tanjiro said, trying to act like her own mother when she was pissed at her and her siblings.

“Tough love mothering approach, not bad~,” Rui said complimenting Tanjiro.

CRACK!

“But that’s not the type of mother I told you to be~,” he said, breaking Tanjiro’s arm without a moment’s hesitation.

“Ahhhhhhhhhhh!!!!!” Tanjiro fell to her knees, holding her broken arm as she screamed out in pain.

“From now on, I’m going to pay extra attention to you, Mommy~,” Rui said sadistically smiling down at her. “Take her inside and get her fixed up. Father and I will dispose of the rest of the rats in the area,” Rui said before leaving with Father.

“I’m sorry, but you shouldn’t have angered him,” Mother said, helping Tanjiro up to her feet with the help of Eldest Sister. “Rui is a very sweet child, you’ll see. You just need to do what he tells you,” she said as they brought Tanjiro inside their home.

“That isn’t the proper way of raising a child,” Tanjiro said to her while holding her broken arm. “Pampering them isn’t the proper way of raising children. You need to be strict with them so they can grow up properly.”

“Even though you were once human, you are now one of us, and even more so you are my twin. I forced you to be my twin just as Rui forced all of us to be his family. I never originally looked this curvaceous, or sexy, and Eldest Sister didn't look like that either. None of us wanted this, but it was either that or death. We do what he says and we play the roles that he gives us. If we don’t we are disposed of and are easily replaced.”

“If you understand this much even as a demon you had no right to do this to me!” Tanjiro yelled at her.

“Because I couldn’t handle it!” Mother yelled, tears flowing down her eyes. “It’s hard dealing with him day after day. I know that I’m not enough for him and that he will eventually dispose of me, but with you, I can make up for my shortcomings! I won’t have to die~!"

“I am sorry for what Mother did, but we all have to do our best to survive Mommy,” Eldest Sister said carrying over a bowl filled with a red liquid inside of it. 

“Mommy? I’m not your mommy,” Tanjiro said to her.

“I’m, sorry but even if that is the case that is your name now. Rui called you Mommy, meaning that is who you are now. Please do your best to remember that he is in control and all he wants is a perfect family. It is our job to do what he says, whether we like it or not. Now Mommy, please drink this,” she said holding out the bowl for Tanjiro.

“What is it?” Tanjiro asked her, grabbing the bowl, still unhappy that she was conversing with demons like this. It was humiliating that she had them crying and worrying about her.

“That is human’s blood,” Eldest Sister said to her. “If Mommy drinks this then her arm should heal before Rui gets back.”

“B-but, I can’t…I’m a human,” Tanjiro said, trying to deny reality. She had already drank human blood before thanks to Mother, and there was no way that she could do it again.

“Please drink it, or he’ll hurt you worse than he did before,” Mother said to her. “We must prepare dinner for Rui soon, so please make up your mind. None of us chose to be demons, and we went through this as well. If it makes you feel better, try to believe that the demon slayers will rescue you and turn you back into a human. Don’t risk our lives because you’re too scared to accept reality. Come Eldest Sister, we have dinner to prepare.”

“Yes Mother,” Eldest Sister said, walking over to the kitchen area.

“Wait…I’ll help…” Tanjiro said before drinking the blood. There was nothing that she could do but accept her fate for right now. Nezuko was still out there in the forest waiting for her. She needed to find her before any other demon slayer or Rui did.

“Good, now let’s get to work~!” Mother happily said as they began to cook dinner together.

It was during this time that Tanjiro was calm. She knew that she should be trying to escape, but in her current state, that was impossible. All she could do now was wait for the right moment. In the meantime, she was able to finally experience what it was like to have a family once again, and it felt nice.

“Mother, Mommy, Eldest Sister~!! We’re home~!!!” Rui yelled as he and Father walked inside. “We didn’t find any traces of demon slayers around, but I know that something is there~. I can feel it~!”

“That’s great~!” Eldest Sister said to him, as she finished setting up the table. “Only my younger brother would be able to sense something that not even Father could sense~.”

“Rui-chan is the best~. Isn’t he, Mommy~?” Mother asked Tanjiro, showing her that this was how she should act in order to stay alive.

“Oh~! Would you look at that? Mommy is already healed~!!” Rui said, happily skipping over to Tanjiro. “Mommy, I am sorry about how I acted before. It’s just that you scared me. Do you not love me~?”

“…I…I…I l-love you,” Tanjiro said, forcing herself to talk. Once things go back to normal she would kill Rui without a moment's hesitation. “I should be sorry for…for making you feel that way.”

“Hehehe~. It’s fine since Mommy learned the error of her ways and has forgiven Rui,” he said acting all cute, but Tanjiro knew that this was nothing more than an act to make her let her guard down. “Mommy, will you eat with me tonight~?”

“But Rui, I thought th-that was my job~,” Mother said nervously, already sitting down at the table with the others.

“I said that I want to eat with Mommy, not you,” Rui said in a dark tone, making everyone their fear for their lives. “Now move!

“Y-yes Rui!” Mother said, quickly getting up before she made Rui even angrier.

“Come Mommy let’s eat~,” Rui said, dragging Tanjiro to the table, and then forcing her to sit down. “And now make some room~,” he said, forcing Tanjiro to open her arms and allow him to sit on her lap.

“W-what are you doing!?” Tanjiro yelled, scared of what this monster brat had planned.

“Me? I’m sitting on Mommy’s lap~,” Rui said in a dark childlike tone. “It is Mommy’s job to make sure that I eat all of my food~.”

“Do…do you want me to feed you?” Tanjiro asked, feeling uncomfortable right now.

“Of course, I do Mommy~!! I’m your sweet baby boy and that means that I need your help to feed me~. Now do it.”

“Y-yes Rui…chan,” Tanjiro said, as she slowly began to feed Rui what she believed to be the remains of the demon slayers he killed. She wasn’t too sure as her Mother and Eldest sister already had the meat skinned before they started to cook it. Though no she was sure of what it was and she hated it. She hated that she had to feed this monster, but she wasn’t given any other choice.

“That was amazing Mommy~!!!” Rui said to her with an innocent smile across her face, making Tanjiro’s heart flutter for a split second to her confusion. There was no way that she thought that he was cute, right?

“Y-you…you have some food on our cheeks,” she said, wiping off Rui’s dirty face, thinking for a second that he was a lot like her little brother before passing away.

“Thank you Mommy~!!” he yelled, jumping to his feet. “Eldest Sister come it’s time for our baths, and we must let Mother, Mommy, and Father complete tonight’s mating ritual~!!!” he yelled grabbing Eldest Sister before running away.

“…Mating ritual?” Tanjiro asked, scared for what was about to happen.

“We must have intercourse with Father,” Mother said to Tanjiro as Father made his way to the next room where they were supposed to commit the act. “Rui says that proper parents must have intercourse every night to show their love to one another. If we don’t do this he’ll kill us.”

“No!!! I refuse to be a part of this! I won’t do it! I won’t have sex with a demon! I would rather die!!!”

“I’m sorry but you don’t have a choice in this matter as this isn’t just your life on the line~,” Mother said, already stripping down butt naked, slowly making her way over to her.

“Fuck you! I’ll-mmmph!” Tanjiro’s tried yelling at her once more, but Mother muffled her complaints by shoving her tongue down her throat. It was time for the fun to begin, and she wasn’t going to let Tanjiro run from this~.

“Nnnnn~!!!” Tanjiro let out a moan of pleasure as Mother’s spider threads dragged him towards the bedroom where Father was waiting. His naked muscly body made her heart quiver at the mere sight of it~. Tanjiro tried to look away, but Mother would not let her. It was then she had to embrace her life as a wife. 

This manner of sex continued for the next hour, putting Tanjiro’s mind in a complete state of confusion. And it only ended when Father and Mother fucked each other to sleep.

“Mo-Mommmy~?” All of a sudden Tanjiro felt someone nudging her awake. She was drenched in cum and her body was sore all over. And for some reason, she could see her younger brother staring at her.

“Huh? What are you doing here?” Tanjiro asked, confused about what was going on, not realizing that she was talking with Rui.

“Mommy I can’t sleep~,” Rui said to her, who still believed him to be one of her younger siblings. “Can you sleep with me tonight~?”

“Sure,” Tanjiro said, thinking that this was some sort of dream, so she decided to get dressed and then follow Rui back to his room. Once there she got into bed with him and they fell asleep in each other's arms, allowing the night to pass them by.

“Ah, good morning Mommy~,” Rui said to the slowly waking up Tanjiro.

“Wahh~!!! What the heck is this!?” she yelled, realizing that she fell asleep with Rui last night!

“Mommy there is no need to fret, Rui is here~!! I protected you all night or rather a morning long~,” Rui said to her.

“Really? T-thank you,” Tanjiro said, unable to think straight after what happened last night. For some reason, she couldn’t look at him as if he was a monster anymore. He was just a small child that was desperate for love. No one ever raised him properly and even his makeshift family feared him. Could she really find it in herself to hate him again? He remained one of her deceased younger siblings. There was no way that she could ever see him as anything more than a child.

“I love you Mommy~!! You make me feel happy~!!!” Rui yelled hugging her once more and this time she actually hugged him back much to her own surprise.

“And I…I l-lo…I love you too~,” she said to him as she slowly started to accept that this was the beginning of her new life.

For the next week, Tanjiro began to adapt to her new life, accepting her name as Mommy. While she was still intent on becoming a human again., she couldn’t help but feel that these demons were now her family as well. While it was true that Rui punished her several more times during the week she realizes now that it was her fault. Rui was a special child and she needed to do everything she could to protect her special baby boy~.

“Mommy~!!! Mommy~!!! I finally found it~!!!” Rui yelled to her from outside where there was a familiar box sitting next to him. The entire family followed her outside to see what Rui has to show her.

“Mommy that presence that I was feeling this entire time, I found it~!!” he yelled eagerly opening the box, and allowing a small girl to fall out of it. Though to Mommy’s surprise, it was none other than Nezuko!!!

“Nezuko!” Mommy yelled, running over to her sister who could barely recognize her smell anymore, but this was enough so that she wouldn’t attack her. “Nezuko! Nezuko!” Mommy yelled, tears rolling down her eyes.

“Mommy? Do you know her Mommy~?” Rui asked, already knowing the truth. He had Nezuko captured since day one. He wanted to break and mold Tanjiro into the perfect Mommy before bringing Nezuko her.

“S-she’s…she my younger sister!” Mommy yelled, unable to hold back herself any longer.

“But Mommy, she’s my younger sister~,” Rui said to her, eager to see the fear spread across Mommy’s face, which it did.

“N-no…sh-she’s Nezuko!” Mommy yelled at him, trying to protect Nezuko, even though deep down she knew that it was too late to stop him.

“Mommy is so kind~,’ Rui said mocking her. “She cares about so many people, even the girl that I brought in to be my younger sister~. But Mommy can’t you see that she is broken? Without my help, she'll never partake in human blood and if that happens she will die~. Mommy don’t you want your new daughter to live as long as possible and become a part of our family~?”

Family. That was all Mommy had ever wanted, a family. This was her chance to live with Nezuko again and be a family~. Though was she ready for this? There would be no going back to being a human if she did this. There would be no chance of regaining her old life after this. Was this something that she wanted?”

“Mommy, please~. Rui wants to be a big brother too~,” he said to her, knowing what she would say.

“Of course, you may sweetie~,” Mommy said before she even realized what she was saying, She had been properly trained by Rui to give him whatever he wanted and that included her former sister.

“Thank you mommy~,” Rui happily said before pinning Nezuko to the ground a white light began to encase her body as Rui began to modify her to his liking. All at the same time Mommy watched with a smile on her face, while the true her was screaming and begging for him to stop.

Once he was finally down, Nezuko’s appearance completely changed. As the Youngest Daughter her physical features were very similar to that of her "Elder Brother," Rui. She now had the looks of a demon girl in her early teens with a completely pale, milky-white skin complexion. She had snow-white hair with red ends and pure white eyes with only her silvery pupils separating them from her sclera. She even possessed several red, dot-like patterns on her face similar to her "family".

“Perfect~!!!” Rui said to his new Younger Sister. “Welcome to your new family~.”

-6 Months Later-

“Run! There’s no way that we can-ack!”

“Tomoki! I’ll kil-ack!”

“Big brother, did I do good~?” Younger Sister asked her big brother Rui, while drenched in human blood, clingy to his arm,

“Of course you did, my adorable Younger Sister~,” Rui said, patting her on the head.

“Fufufufu~. Well of course the two of you would do well~,” Mommy said sitting on the lap of Father with Mother. “You are all our children, Rui did the best as always, Younger Sister did her best and Eldest Sister beautifully tortured those that tried to flee~. Those pathetic demon slayers never learn that our family is impossible to defeat~. Ohohohohoho~!!! Just come and try~.”