Take her anal cherry, of course.

"Just think of it as an experiment - but you're the subject."

You step right up and press your gleaming, throbbing erect prick into the valley of her ass, grinding it against her.

"N-no!" Her juices are just coating her thighs so you scoop them up on your fingers and use them to lubricate your turgid piece as much as possible. Then you trace the cum-slick head down the crack in her ass and press it to her asshole... pretty as an asshole could be and already a little open from your fingers. Below it her perfect cunt oozes girl-cum and twitches uncontrollably.

"How many strokes of my cock in your ass will it take before you cum like the anal slut you are?"

"P-please..." But you don't wait, and gently but firmly you press your burning manhood against her rear entrance until it yields and allows you to invade her - easing your cock into a hole that has never had one before. Taking her anal virginity.

"This is incredible," you gasp as her ass holds you like a vice. You push in more and more, astonished that this woman, who had looked like butter wouldn't melt in her mouth, would have an ass that could take your entire length.

"Oh no! Oh NO!" Her hands are fists as you thrust into her virgin ass, stretching it around your thick cock.

"One," you count the first stroke as your hips rest against her heavenly ass cheeks. You're buried entirely in her. Amazing **** indeed, to get this angelic scientist to give you an ass fuck like a porn star. "Tell me you're a whore."

"Just... just do it." She gasps.

"Tell me you're a whore or I pull out and leave you mad with desire." You pull out, and she grips you tight all the way. When you thrust back into that tight, hot hole it's easier. It's not lubricated enough, but she's so turned on and out of control that it's relaxed enough. "Two."

"I'm a whore!" she cries out. "I'm a dirty ass-fucked anal whore who loves it in my ass!"

She's losing it completely now, and as you pull your prick out again (spitting on it and using her juices for more lubrication) she doesn't need prompting to keep up the filth. Again, there's the twinge of guilt for reducing this woman to a dripping harlot, begging for her ass to be fucked, but it's so unspeakably hot that you push it aside.

"I'm such a fucking, slut, whore, cunt..." she moans, "With your cock in my ass - fucking my ass... fuck it's so good! Why? Why am I... Am I going crazy?"

You hope this isn't actually driving her crazy, but it might drive you crazy. Fucking her ass is close to heaven, and you can't last long. You forget to count after three strokes but it doesn't matter. It doesn't take her long.

"Oh no! Ohnoohnoohno!" She squeals and suddenly you feel a spray of her juices hit your thighs as you keep ploughing steadily into her asshole. She didn't just cum, she squirted from being fucked in the ass. "I came!"

"You fucking squirted."

"No! No I can't have..."

"You squirted from being fucked in the ass," you chuckled, "no-one even touching your pussy."

"My God... My God... I'm such a slut..." and the note of defeat in her voice this time the way she hangs her head... it's too much.

"Grnngh!" You heave and thrust and bury yourself so deep in her ass that she squeals in surprise. Your prick bucks and your balls squeeze, shooting pulse after pulse of hot cream way into her divine rear. "Oh fuck!"

"Ahn! Oh no! Please don't... you're making me..."

And it's true. Despite a massive, shattering orgasm moments ago, as you pump your seed into her ass, another spattering of Felicities hot juices sprays onto your legs.

"Aaahn! Oh no! No more! Please..."

You stroke the last few kicks out of your balls, then pull out of her well-fucked anus with a pop. Her knees sag and she hangs onto the bench to keep from falling to the floor. You wipe yourself off with the dress you cut off her and watch as your thick, white cum, oozes from the perfect woman's open, fucked asshole. The floor is slippery with her fluids, and her hair is plastered to her face. She looked amazing when you first came in, but she still looks amazing now.

You untie her hands, and she rubs her wrists as she slumps to the floor. What a victory. Plus you can take some of these grey feathers with you to use on your next opponent.

"Don't... take the feathers." She whispers, and looking down you're astonished to see that she's still not finished. Still under the influence of the **** she's lying on her back, plunging two fingers into her sopping cunt as she looks up at you. God, she really is starting to look like a dirty slut. "Don't cheat..." As you watch her breathing speeds up, her fingers do to and another small orgasm shakes her, making her lush breasts jiggle.

Fuck, you could probably stay here a bit longer...