Break them

Dr. Black starts to record another note, something about your refractory period but you're studying the restraints. It still seems like it should take more strength than you have but your body is pumped with adrenaline as well as whatever was in that pill. Suddenly you swing your arms to the sides within your limited range of motion, slamming into the frame with a pain that's easy to ignore and a splintering noise of hinges breaking. Another shift and the restraints fall from your arms as you swing your legs and stand. Your cock proudly erect in front of you. Dr. Black's eyes are wide as she looks at you but she makes no move to run as she places the dictaphone on the desk beside her. You can see how your escape has caused her heartrate to elevate, her tongue flicks nervously over her lips and the sweet smell of her arousal seems strong enough to you to be ****.

"Kneel." You **** out the word rather than forcing her to her knees. Part of you knows you're giving her the chance to refuse this way. She doesn't. Obligingly she slides down to the floor, looking up at you with some distance still seperating you she opens her mouth wide.

You can't resist an invitation like that. You close the distance in seconds. You grasp her head and desperately slam your cock into her. She gags as she wraps her lips around you. You pin her head between your hips and the desk and fuck her pretty little mouth. The relief is exquisite, it felt like hours you'd been throbbing and erect for, just needing to sink into a warm hole. Barely a moments pause in the burning need when you climaxed over yourself. You push all the way into her, animalistic and driven. Dr. Black gags but manages to take you into her throat, some of her drool dripping down her face and your balls. As her tight throat squeezes around you with your next thrust you start to climax. You don't stop thrusting, forcing her to start swallowing your seed or ****. She coughs and some of your pale cum dribbles from her mouth. You still need more.

For now you just don't let up. Her throat milks you so nicely and you're making her look so pretty. Her eyes water and her makeup runs down her face through the tracks her tears make. As you feel another climax building you manage to pull out of Dr. Black's mouth. You hold her head where you want it with one hand and your cock with another. She looks up you, mouth open and tongue out. You second load still dribbling out of her while your first load glistens on your own stomach. You shudder and your seed shoots with more **** than you'd anticipated, splashing across her face and making her close her left eye. You manage to get some into her waiting mouth and she hungrily swallows it up. You can barely remember why you're here. This hardly seems to be the Dr. Black who was in charge of your study. She clearly enjoys being told what to and as your cock continues to throb you're already ordering her.
"Strip."

She obeys, standing and obediently shedding her white lab coat, throwing it aside. Her floral dress underneath has been marked where drool and cum have run down her neck and between her breasts to soak into the fabric. She slides the straps off of each shoulder and the dress falls to the floor. She isn't wearing a bra and you gaze at her perky breasts while she pulls down some tiny yellow panties too quickly for you to appreciate them. Her body is toned and hot as hell but you're not in the mood to just look.

"Turn around." She does and you push her upper body down, leaning her over her desk and making her present her opening to you. You line up and push in. You'd felt almost in control of yourself for a moment but as your head opens her up and you feel the soft warmth of her pussy all you know is that you need to fill it with your cum. One hand grasps Dr. Black's hip and you start to use her roughly. Her moans seem to echo off the blank walls of the study room and the noise of your skin meeting again and again provides a background percussion. You're going fast, not playing gentle but Dr. Black doesn't seem to mind. Moaning like a whore, no words as your maddened thrusting puts her in an animalistic state similar to your own. Not that it matters to you. She could be completely silent and all that would matter is that you would eventually climax. You gasp, your fast and erratic thrusting already pushing you over your easy to reach precipice. As your cock twitches and spurts deep into her you don't let up for a second. Your thrusts just pumping out this load as you chase your next.

Your seed drips down Dr. Black's leg and you squeeze her ass and drive as deep into her as you can. Squashing her between you and the desk. She starts to shudder underneath you, her pattern of moans making it clear she's about to climax for you. You just pin her down against the surface so any thrashing won't interupt you. Her pussy clenching forces out more of your seed but also provides you the delicious sensation you need to provide her more. You're not sure how much more your balls can have in them, you've coated so much of Dr. Black's pale skin at this point.

Her moans take on a delightful higher pitch and it combines with her panting as she realises you're still not done with her and are offering no breaks. You plow into her again and again and catch sight of the timer ticking up. It takes you a minute to unload into her again and another minute for the both of you to climax together once more. Your cum flows down her legs in an almost constant stream, even without your cock filling her to capacity you've pumped more cum into her than her pussy could have held at this point. Her gasping noises are tired now and as you approach another clinax you pull out and rest the head of your cock against her tight asshole. She twitches but you don't push in, simply climaxing with your tip right to her hole, finding somewhere new to deposit your load.
You breathe heavily and you feel your cock for the first time in what feels like hours start to soften. You still want to cum but it's fallen to a level that you can manage, more like you're just horny and haven't cum for a while. Despite the overwhelming evidence to the contrary.

Dr. Black shakily reaches for her dictaphone on the desk and checks the timer. She takes a moment to breathe deeply and when she speaks it's almost with the same professional tone as before. "Patient achieved eight climaxes with a 25 minute period without any loss of stiffness, urgency or perceived load volume. No refractory period was noted." She turns to look at you as she speaks, and raises an eyebrow coated with your cum as if to check that. You nod, that seems accurate. 25 minutes is insane, each second that you weren't climaxing felt like a lifetime but you can see the timer clear as day. She pulls out a roll of paper towels from the desk and offers them to you. You clean yourself up.

She nods to your clothes, "please get dressed. We are all done for today." Professional again, naked and covered in your cum and still a little flushed from her own climaxes but professional. You pull your clothes back on in slience but look back to her when you're done. She seems to be collecting some of your cum in specimen vials from her face and legs. Which you guess is one way to get study samples.
"I, uh, I could tell you were into it but I don't know if I'd have stopped if you weren't..." a warning you feel you should offer. She turns to you and nods with a cum soaked smile. "Don't worry, this was well within expected parameters." She winks, "I am very fond of my job. Please do come back for the follow up study when we contact you."

To be honest you think you're still a little shocked, you nod and make your way through the door. You look back as the door closes to see Dr. Black licking some of your cum from her fingers. This was a weird research study...