Surprising submssion

Cassie had no chance. As soon as she saw merely your human form, she was aroused. "FUCK!" she moans.

"My girlfriend has never, OH!, made me feel, FUCK!, this good!" she screams between moans, as your tail pistons into her drenched pussy.

"Ooooh, already a little sinner, I see," you tease, palming and squeezing her tits.

"Yeah, I'm a little sinner slut! I want to go to hell. Please take me there!" Cassie moans and pulls you into a sloppy kiss.

Not one to deny such a request, you paint her womb with dark cum as your tail explodes with release and your pussy sprays juices over the girl's stomach and legs. Moaning deliriously, the girl slumps off your still spurting tail and furiously rubs her reddening vagina.

You lick your fangs and close your eyes, savoring the feeling of her soul passing through you down to the abyss. When you open your eyes, you gasp as, like a wave of red ink, a dark red spreads over her body, which is already filling out to sinful proportions. Her smallish tits swell to a healthy D cup as the spreading corruption flows up from her crimson pussy and now-taut belly. Now spreading downward, Lilith's gift widens Cassie's hips and molds the girl's ass to a tight bubble and tones her legs. At once, her nails sharpen and turn onyx-black as obsidian horns erupt to crown her beautified face and raven hair. With a triumphant moan, Cassie is completed when black, reptilian wings erupt from her smooth, red back.

Looking at you lustily with black, crimson-slit eyes, Cassie breathes, "what is your will, my mistress?"