Jacob's Hell-Triggered Transformation

A TF story!  Hope you like it! C:

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 Jacob moaned as he exited the succubus, the naked human’s cock sliding out of her.  “That was good,” he said, panting.
“I agree,” the succubus, Gorgonous, said to him.  “We should do that again sometime, cutie.”
Cutie?  Jacob looked at himself.  He was a mostly average guy, slightly chubby, with not a lot of muscle to him—his body made him rather insecure, if he was being honest with himself.  His black hair was messy and his eyes were baby blue.  But everything about him was going to change in a moment.
“Should be any second now,” Gorgonous told Jacob, who gave her a confused look.  “Just give it a second, and—”
“AHH!”
Jacob let out a startled cry.  Pain shuddered through out his body, and he bent down on the bed, sweating.  What was going on?
“Ooo!” Gorgonous exclaimed, smiling at her lover.  “Looks like the transformation is starting, babe.  Isn’t that exciting?”
Jacob opened his mouth to respond, but that’s when he noticed his jaw was sliding forward, extending in size right before his eyes, and he screamed in surprise.  His new snout paid him no mind, and simply kept going, stopping a few inches in front of him.  When he opened his new mouth, he could feel his teeth extending outward, becoming sharp fangs.  At the end of his snout were the two sharpest teeth, which crept outward in an overbite.
His eyes widened in surprise, and then kept going, getting bigger and taking up more space on his face.  The pupils darkened from baby blue to yellow orange.  His nose leveled out on his snout and became part of it, turning into slits on the surface.  His messy black hair flattened, then shrunk into his head, until it was completely and totally gone.  Then he felt his ears widening, and they became diamond-shaped, extending to the size of his head.
One more thing, and his face was complete: pain erupted on the top of Jacob’s head, right at his forehead.  Then he felt two nubs growing out, quickly extending in size.  He reached up and felt the area, and was surprised to find that he now had two horns: these gray appendages stuck out above his eyes, sharp and dark as stone.  As he was feeling them, red scales spread onto him, starting at the tip of his snout, and quickly spreading across his entire face.
And this was just the start of it all.
The red spread down his neck and to his chest, and as it did so, Jacob felt pain coming from his back.  Then his skin began to expand there, in two areas, becoming flat, thin things that poked out from behind the transforming human.  Then those thin things grew veins and joints, and before long, they were fully-fledged wings, draconian and large, extending out from behind Jacob.  He hesitantly flapped them, and they responded in turn, sending a small gust of wind from behind him.
The transformation continued to travel down his body, slimming down his arms and stomach as they, too, turned red.  His fingers shrunk down, and became clawed, his dull nails melting into the skin and then becoming pointy.  On each side, his pinky shrunk in his hand completely, so that the former human only had four fingers on each hand.
Then it was time for his midsection to change.  As the red traveled down his hips and to his legs, the transformation reached his dick, and began to alter it.  First, the shaft twisted and changed, becoming wavier in appearance, but not symmetrically so.  Then, the color changed, and it became a dark blue color, with baby pink stripes traveling down the length of the member.  Finally, the tip of the cock was transformed, and it became pointed, sharp.  The more his penis changed, the more turned-on Jacob was becoming. . .
The red scales traveled down his legs, changing their appearance completely, layering the skin as they went.  Then it reached his feet.  First, his toes extended in length, the joints becoming more pronounced and angular.  Then, his toes became sharp, like his fingers, and the nails melted into the skin as red took them over completely.  Finally, his two smallest toes shrunk into his skin, and the structure of the foot adjusted slightly for his three toes.  Finally, it was done.  
Jacob moaned.  Fuck, he was getting so turned on right now. . .
His body was almost done changing, but the transformation had one more thing to add.
He felt it in his ass: a throbbing, just like with the wings and horns.  Then, a large structure began to snake out of his behind, slowly crawling down his back, and Jacob knew it was a tail.  It was huge, thicker than his arms or legs, and as it slowly grew, the human knew he couldn’t take it much more. . .
At the peak of his transformation, as his tail began to grow out, the former human came, spurting magma orange semen out from his pointed dick.  The cum splashed onto the bed, so hot that it steamed and dug itself into the sheets.  
As Jacob caught his breath, the tail continued its extension, snaking down the bed, becoming almost as long as his body now.  Until finally, his tail completed the growth and came together in a point, the big appendage flopping onto the sheets.  At the end of the point, fluffy, dark blue fur came out, the same color as his dick, until it was all neatly bunched together, complete.
Jacob felt his whole body level out, shrinking down just a bit, and then, it stopped.  His transformation was done.
“So, an imp, huh?” Gorgonous asked, laughing.  “I was wondering what fucking me would make you transform into.  And I must say, you make a /great/ hell creature.”
Overcome by horniness, Jacob pounced on the succubus, grinning down at her and thrusting his cock inside her.
“Ooo, feisty,” the succubus said, moaning.  “I like that.  Do continue, imp~.”