No One Can Resist Lilith

Allegra continues to avert her gaze, biting her tongue and trying her best to squirm away from you.

"You seem less talkative, my little songbird." Mother whispers into her ear in a teasing tone as she continues to hold Allegra against a wall. You can see Jenny standing off to the side, the energy overflowing in the room has caused her to slump to the ground and masturbate mindlessly.

"Go...Fuck..." Allegra yelps as your tail thrusts deeper into her. You're amazed at just how strong her will is, with your Mother's very being within you you can see into her memories and know this is the most resistance she's seen from any mortal in ages. But you know her resistance is futile, Mother has broken countless mortals who have ended up in her domain, who thought her a mere puffed up succubus, who thought they were immune to sexual temptation.

"I'm sorry, fuck what?" She says with a knowing tone, Allegra has stopped fighting and so your hands release her. Instead they tear her shirt open and begin to grope and play with her tits, stimulating her all the more.

"Fuck me! Fill me up! I don't fucking care anymore!" Her voice is a mixture of resignation and excitement, part of her is probably still trying to resist you but it's too late now. Your tail practically projects demonic essence into her, she screams in rapture as her eyes gain that familiar purple glow. You can see her soul's mortality gutter out and die, replaced by the mark of your Mother. As you pump more and more of your essence into her she begins to change from your friend into your sister. Her skin begins to turn purple, an even darker shade than yours, her hair somehow turning an even darker black. She moans in pleasure as her bones and muscles crack and expand, growing taller and sexier. She's also far more muscular than you, not that your perfect body is lacking in that department, while still maintaining the same figure you possess. Finally her tails and wings burst forth, identical to yours, as well as two wickedly sharp horns that curl back almost entirely around her head. She screams one last time as it happens, forcing herself upon your body as her transformation finishes.

"Oh Mother, how can I ever repay you?" She says in between frantic kissing and fingering. Both you and your Mother are pleased with just how eagerly she has taken to her new life.

"The best way to repay my sweet daughter, is to help us anoint your newest sister." Both of you turn to Jenny, still deliriously masturbating in a corner. Allegra smiles wickedly as both of you approach her.