It's too late for her

"I don't want to."

"You don't what?"

"I don't want to leave," Yara said, her eyes glazing over, hints of purple leaking into her blue orbs. "It feels so good, you have no idea. Oh, I could almost cum and I'm not even touching myself yet. Do you know how sensitive my tits are? Fuck, I can't wait until one of those studs sucks on them while he's shoving his dick in my twat." She shuddered violently, her fantasies feeding her impending orgasm. "It's too late, Harley. You need to run before I become a slut like them. Before I want to push you down and eat that tight little ass of yours. Please, run." Yara couldn't help herself anymore, one hand shooting up to her heaving chest, mauling her breast through her shirt, the other squeezing more of the juice from her dress and bringing it up to her mouth. She shot her sister one last pleading look before her tongue, longer than it should be, snaked out to lap the cum off her fingers. Once Harley turned and ran towards the window with tears in her eyes, Yara lost control entirely, surrendering to the pleasure and the virus that coursed through her in equal parts.

She could barely keep herself upright, the pleasure was so overwhelming. Her hand pulled the neckline of her dress down, freeing her modest left breast. Her breath caught as she pinched the pebbled nipple, the feeling traveling straight to her groin. Every good feeling in her body was pooling there, creating a huge wet spot on the back of her dress. She still didn't touch it though, wanting to save the sweetest pleasure for last. Instead she freed her other tit, the small c-cups sitting side by side. They throbbed delightfully with every breath and stroke from her hands, which she realized now sported claws when the pointed tips traced over her skin, throwing her into another bout of shudders. At the same time, she felt her breasts push harder against her talons, the gentle globes gaining more weight and size on her chest.

Yara squeezed her eyes shut, trying to reach her orgasm and stave it off in equal parts. She felt rather than saw the wave of changes that washed over her, skin paling to a grey-ish purple tone. Her ears became pointed and wings grew from her back. Intricate tattoos crawled across her skin, glowing with a faint purple light, while her hair lengthened from its short bob to brush her shoulders, deep purple overtaking the black strands. Her face itched as it shifted, becoming perfect and supernaturally beautiful. When she finally opened her eyes again, they burned with the same purple luminescence as her tattoos.

Yara looked at herself with awe and amazement, taking in her changed body still wrapped in her green dress, hew new larger breasts hanging out of the top. 'No, not breasts. These are tits. These are made for sex, for pleasure. I'm made for it.' She stroked the dark purple nipples crowning her perky tits, a stronger wave rushing through her. It joined the overwhelming buildup between her legs and rolled up her spine. She could feel it crash into her brain, destroying what was left of her inhibitions and restraint, leaving her as nothing more than a willing and eager demonic whore. The intense feeling of knowing what she was turning into and welcoming it was the last straw.

The pleasure surging in her cunt broke free like a dam, the most intense orgasm she had ever experienced blowing the remainder of her mind to pieces. Her ass grew to match her tits, straining the tight lower half of her dress to its absolute limit. Her thighs thickened and her calves toned, giving her the legs of any man's dreams.

But the most intense feeling came surging out of her crotch, shooting out like a shot from a cannon. A distinctive bulge appeared beneath the fabric of her dress, pressing up as if to escape. Yara stared at it for a breathless moment before her hands reached down and shredded the fabric of the skirt. A proud, meaty cock sprang up, flicking beads of precum onto the demoness' chest and face. Yara could do nothing but stare at it, at its bulbous head and veiny shaft, the thick girth sprouting from where her clit used to be. She could still feel her pussy, dripping and hungry for cock, but was more preoccupied with the way her own penis bobbed in the air in time with her heartbeat.

She stared for a moment more before gently touching it with her hand. Her eyes rolled back in her head and she had to suppress the urge to scream, it felt so good. 'If this is how men feel,' the sincubus thought, 'I can hardly blame them for constantly wanting to get off. Oh fuck, I can't wait to cum and shoot some poor girl full of my jizz. I wonder if they'd grow a cock of their own? Only one way to find out, I guess. And I know the perfect candidate." The fully corrupted sincubus rose to her feet, pulling the last scraps of her green dress off of a body that would never be covered again. She smiled ferociously and began stalking towards her prey.