She binds you for her pleasure.

Fearfully, yet with a palpable heat radiating from your body, you begin slowly backing away. Maybe, if she doesn't touch you again, there's a chance...
"Don't try to fight it," Lynn moans seductively, teasing her stiffening nipples with her wicked claws. She matches your slow gait, though hers is easily twenty times sexier, more alluring. "It's useless to resist your lust." She tosses back her long mane of completely jet hair, letting it settle around her pointed ears. "Claim it. Become it. Feed from its power!"
"Lynn," you half gasp, half moan. Just looking at her is making you hornier, but you find it impossible to avert your eyes. "Please, please don't. I...I tried to save you..."
She tilts her head back and laughs, exposing her full fangs. "You mean, you tried to keep me mortal, human...weak!" She jumps deftly up to the kitchen counter, curling her tail around her thigh and shuddering with evil delight as her body-length bat-like wings unfurl from her shoulders. "I will never be weak again! I am one of Lilith's children, just as you shall be!"
Her completed transformation rakes you with fright and excitement, and you begin frantically clawing and tearing at the fabric of the couch and chairs barring the door. Lynn laughs wildly, as you barely realize you're grinding your nipples across the supple leather with each movement.
"There's no escape, sister," she whispers, snapping her fingers. You feel your waist suddenly seized by the arms of the leather recliner, as it bearhugs you down ass-first into it. You scream and struggle as the couch joins suit, splitting the arm rest from its frame to engulf and clamp down across one of your ankles. While the power cord of the nearby floor lamp ties up your opposite ankle, you feel your legs being pulled almost painfully wide, fully exposing your moist pussy to Lynn's delighted view. An overhanging plant snakes its lengthening leaves toward you, and as they seize and bind your wrists together, you can see them transformed into green penises while they pull your secured arms over your head.
"Now you're beginning to feel the true powers of a demoness," Lynn hisses, "and there are more lessons you'll learn soon."
"No...please...let me..."
"Fuck you, Mistress Lynn? Eat your hot wet snatch until you order me to stop, Mistress Lynn? Be your eternal fuck toy, Mistress Lynn?" She smiles as her tail cock slides deep inside her own red, hairless snatch, working her articulate dark pussy lips to suck herself within. She moans deeply while she spreads her legs across the counter, pleasuring herself for your ****.
"You're already blessed with Lilith's power. Now, let yourself become." She ruts herself furiously and brazenly before you, burning your will to cinders with her dark demon eyes and moaning "lust" over and over, like a command you are rapidly feeling compelled to obey...