Succubus

"Why not try out a new life?" the smiling woman with purple skin, black eyes, small goat horns pressing out of her forehead and raven black hair on the graffiti suggested in a flirty voice, pressing her breasts together at the squeaking sound of her latex bikini top and thong for you to gawk at. It even looked like she noticed and approved of your gazing at her assets.

Josh hadn't really been into this sort of stuff before, but his curiosity made him step closer. He even could feel a hint of arousal at the sight.

"No shame, lovely curves, arousal all day, and," she grabs hold of one of her impressive breasts, pull out a fat erect nipple, gives it a squeeze which makes a milky but purple-black substance. "bodily fluids with transformative aphrodisiacs," she adds as a serpentine tongue slithers from her mouth, licking the fluid off her nipple. her other hand rubs at her crotch where her clit, apparently over an inch long, twitches and rubs against her thong. She moans and gazes directly into his eyes.

Josh glanced around as he took a deep breath. He was starting to sport a boner now and didn't want to get caught glaring at some porn advertisement. Still, this advertisement seemed very interesting, some part of his mind told him.

"Want to give it a try? Sign up now and you get a free trial week," she said as a spaded tail slid into view and drew a purple square in front of her, the text 'Try 4 free, 1 week S-Bi form.' "LewdU4U quality guaranteed, some rights reserved," she adds as a smaller square filling up with lines of text appears next to the green accept box.

Josh surprises himself when his curiosity makes him touch the purple accept box. He feels a small zap in his finger before the box blinks away. Josh refocuses on the purple demon-girl as she sounds a happy squeal, bounces in spot and spins for a moment, her tail swooshing eagerly behind her and her assets jiggling enticingly, shoulder-covering leathery wings flapping on her back. "Thank you for trying out our one week S-Bi form. We recommend re-applying your safety amulet, and finding a private location to enjoy the change. Guarantees, warranty details and information can be found at lewd U 4 U dot com," she smiles as the graffiti flickers and fades into nothingness.

Josh blinks at the mention of a safety amulet. He pulls it out of his pocket and puts it around his neck, and immediately notices that the curious and aroused feelings he was having evaporate immediately . A smaller graffiti further away by the gateway slides down the wall and slithers off into a drain after going red Josh can barely notice that it looked like a pixie body with a massive head with the classic jeering troll face on it, pausing and visually chuckling before disappearing.

A cold shiver of apprehension crawls down Josh' back as he feels a throbbing in his crotch, his heart beginning to race. He leaves the alley in a hurry, moving back towards his apartment, which is still closer than work. He gets back home and slams the door shut, the throbbing in his dick now even more insistent. He moves towards the bathroom and pull down his pants. Instead of the cotton boxers he'd worn this morning, he now apparently was wearing briefs. As he pulled them down, his dick bounced to attention. God, it looked to be an inch longer than usual, but the biggest difference was a blue-violet skin tone that was quickly spreading out from the tip of the dick.

As Josh grabbed a hold of his dick, he was wracked with pleasure and felt himself begin to ejaculate. He supported himself across the wash basin and held his dick down. A black-blue fluid began flowing out, but it didn't really spurt like it usually did. It flowed slowly, trickling off his dick and sticking to it, coating his fingers. And it didn't stop flowing. Before long the wash was spattered with black goop, and an arousing exotic smell began to permeate the room. Josh, still leaning over the basin, pulled a drop of the fluid up to give it a closer look.