Hergix’s Jack-Off Transformation

New commission!  This one's a transformation sequence, and it was super fun to write!  I hope you also enjoy it! C:

Also, vote in the new poll if you haven't yet!  Voting ends in two days: https://www.patreon.com/posts/37146850 

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 Hergix sat down in his chair.  He’d pulled up a quality porno on his laptop, and had everything ready.  It was time.
The young man unzipped his jeans, and let his hard cock peek out of his clothing.  He had been horny all day, and was holding back his desires until he got home.  Now he was home, and he and now, he was going to have the jackoff session of his life.
Hergix pulled down his underwear, and gently started to handle his member.  Slowly at first, he moved his hands up and down his shaft, stimulating it just enough as the porno played in the background.  Up and down he went, starting off with a gentle touch to get him going, but speeding up as the porno got hot and heavy.  At some point during the process, he leaned back in the chair and closed his eyes—the human liked letting his visual sensations fade into the background, and having auditory sounds take over and turn on his mind in /just/ the right ways.  He moaned at the sounds form the porno, pressing himself against the chair and smiling as he jacked himself off.
It was at the peak of his desires that the transformation began.  Out of nowhere, Hergix’s flat stomach suddenly swelled up and plopped onto his legs, ripping the bottom of his sweatshirt.  Then his waist, chest, and hips swelled up, enlarging and tearing his sweatshirt right down the middle with the growth spurt that occurred.  His legs increased in size, straining and ripping the young man’s jeans, and two ponytail-like antenna sprouted from his forehead.  His hair and eyebrows shrunk into his head, until they disappeared entirely.  Then his ears did the same, flattening against the human’s head until they were no longer visible.  But the young man was so caught up in his fantasies that he barely noticed the changes.
His skin began to turn green.  First it was just his hands, which faded from a pale peach, to a darker shade of lime green.  But then the color began to move upward, crawling up Hergix’s arms and changing his skin; it then colored the top of his head and the antennas that had sprouted there.  Then the lime green went downward: it colored the human’s now-large legs and his unchanged toes—now, it was complete.
There was one more color that wanted to invade the human.  His swelling stomach twitched, and then turned a shade of forest green in color.  The forest green went up his stomach, to his chest, up the human’s throat, and stopping halfway up his head, splitting the space between it and the lime-green that had settled there before.  Finally, and olive-green shade formed underneath Hergix’s chin.
But the transformation wasn’t over yet.  Hergix’s human toes shuddered, and then they began to merge together.  He went from five, stubby toes, to two, sharp toes, exploding through his sneakers, all in a matter of seconds.  Then the same happened with his hands: his fingers merged together and went from five to two.  But the young man was still wrapped up in his passions, running his hands on his dick.  When he felt the tingling sensation in his hands and feet, he took them as merely more sensations to what he was currently experiencing, nothing beyond that.  And fuck, did that turn him on.
That’s when a tail sprouted from his ass.  Hergix moaned at the feeling coming from his arsehole, as the massive tail started to emerge from it, breaking through the young man’s jeans.  This one was half lime green, half forest green, with three dark triangles going down the middle, separating the colors with a thick line.  The tail started small but thick at first, a thing as large as Hergix’s head slowly coming out of his behind, sneaking into the world.  Then it grew larger and longer, until it covered Hergix’s entire ass and part of his back; it snuck between the bars on the chair and flopped on the ground.
The porno played louder.  Hergix was having the jackoff session of his life, with all the various sensations throughout his body as it changed.  It was absolutely wonderful, and extremely stimulating.  The young man rubbed his tight member, struggling to hold it all in.
As he was masturbating, his genitals started to change.  A small slit formed underneath his member.  Slowly, it began to enlarge, changing his insides and outsides in mysterious ways.  When it finished the process, Hergix had a fully equipped vagina nestled underneath his cock, ready for use.  As it finished forming, his chest expanded outward, and became two large, full breasts.
Then, the transformation made its final steps.  The human’s eyes grew larger, his head became rounder.  And then, Hergix was fully a Goodra.
That’s when he released.  
Hergix gasped as the tension that had been building up finally came to a climax.  Cum sprouted from his enlarged penis in shades of green and purple, spilling all over the room. It came out in huge, unreal bursts, messy spurts that surrounded Hergix as he orgasmed.  The bursts came out again and again, forming large piles around the Goodra as he satisfied himself.  When it was done, Hergix let out a long, happy sigh, and panting from exhaustion at the release.  Then he finally opened his eyes.
The human was confused at first, looking at his two-fingered hands, round stomach, and massive legs.  Then he caught a glimpse of himself in the glass of his computer screen, and his eyes widened.  Hergix quickly paused the porno and studied himself more closely, staring at the large antennas and enormous tail, the round head and big eyes.  He had seen this creature somewhere before, hadn’t he?
Then he realized: of course!  He was a Goodra.  He was really a Goodra!  One with a nice cock and vagina, at that.  And those breasts. . .
Excitement surged through the human, and he grinned, closing up his laptop.  He didn’t know why or how he had transformed, but he was going to make the most of this opportunity.
Starting now.