Instead of immediately pleasuring you, Petra instead turns to the other girl, whose name you never bothered to get.
Petra nuzzles her face against the bikini bottom of the young woman, who compliantly pulls them off, revealing a clean-shaven mound. Petra begins to eagerly lick at your companion's vagina,immediately causing a flow of juices to roll down her thighs and into Petra's mouth.
The other girl's reaction is puzzling to you, as she didn't moan, though her face showed obvious signs of pleasure. Instead, she is whispering a phrase over and over, at first barely a whisper, but then audible enough for you to hear. "Let the beast inside become the beast outside...let the beast inside become the beast outside," she chanted.
You wonder if you're watching some bizarre performance piece for a moment, as neither woman even seems to realize you're there.Then Petra pulled away from the other woman, and climbs up onto the bed with you, her eyes glowing green, and it's not simply a trick of light.
Petra climbs on top of you, begins to grind against you. She's smiling widely at you, and now you see her teeth beginning to elongate, and you realize you've stepped through the world of normally perceived reality into a realm of something entirely different. You hear a tearing noise; you look over and see her hands tensed as talons grow from her nail beds and dig into the sheets.Every muscle in her body is tensed up and twitching as the change progresses.
You can feel her musk dripping from the edges of her bikini bottom onto your cock. Against your will you push up against it with your crotch, thrusting your penis futilely against the soaking wet fabric, unable to understand your lust, only wishing to fulfill it. As Petra's spine bows and her tail begins to blossom, the strings holding both pieces of her suit on fail simultaneously, and the barrier falls away. You slide in effortlessly eliciting a growl of pleasure from Petra, even as her vagina shifts, beginning to restrict your access.
You hump madly as she changes, her twitching, vibrating slit bringing you pleasure that you never imagined possible. You orgasm inside her as her whiskers bloom and the black fur coat is nearly fully grown, all under the silent, watchful gaze of the girl that brought you to the room. But instead of a mutually-shared afterglow, you watch as she rolls off of you to complete her change, still rock hard from the combination of sensation and taboo you've had.
Petra makes no move toward you, despite letting out a loud growl upon her change's end. Instead she simply watches as the other woman now climbs into bed with you.
"You realize there's a price, right?" she asks, a smirk on her face.
"I...I thought this was free with admission," you tell her, now a bit concerned.
"There's always a price," she tells you, "You know how they say there's no such thing as a free lunch? Well, there's also no such thing as a free piece of ass."
"Well..." you stammer, trying to figure a proper answer to her.
"Oh...don't worry," she says in an almost too-casual way, "I'm sure we can work something out." She moves up higher on the bed, her vagina inches from your mouth. "Now be a good boy and take your medicine."