I hung up the phone as I walked into the Bell Towers Apartments to pick up the students. I had stopped at home briefly to change and get my ID badge for the labs. I also took the opportunity to reach out to some colleagues in my department, trying to get an idea of how to handle the rebound affect that had gotten so out of control. As I stood in the elevator heading up to Madison’s floor, I looked at my reflection in the polished metal door, shiny enough to serve as a mirror. What I saw made me smile.

“I’m just changing out of these dirty clothes before I head over to pick the students up” I had lied to myself at home. Instead of grabbing just anything, I put on an outfit that made me feel sexy. Powerful. Worthy of love. I wore a black pencil skirt that came down barely half way to my knees, with a fitted white blouse that had a sheer lace yoke at the neck. The push up bra underneath was uncomfortable – it had been years since I’d worn one – but made my tits look incredible. Like I was 23 again and they were still infinitely perky, but with a full chest I’d only grown by my 30^th birthday. I wore stocking under the dress (I wasn’t totally crazy) but took the effort to put on the garter belt and wear my best knee-highs with a matching thong. “To look professional” I had pretended to myself.

Looking at my reflection in the elevator door, I decided I looked sexier than I had ever looked in my life. My long-toned legs looked incredible in the dark stockings. My thighs were visible below my skirt and my tits were something that could stop traffic. My dark rimmed glasses complimenting my dark eyes and hair perfectly. If anything, I thought I might have gone a bit too far.

And then I walked into Madison’s apartment and realized how very wrong I was.

Any idiot would have known exactly what the two of them were up to immediately. The state of the apartment was a disaster and the overwhelming smell of cum, pussy, and sweat all but knocked me on the floor. But Neither of those things were what I noticed first. Instead, the first thing I noticed was Madison herself. She sat draped on the couch, arms resting on the back cushions as if she was lounging in total relaxation. She wore a T-shirt and nothing else, her vagina on full display for any and all to see.

“Jesus Christ Madison!” I said without thinking. Her pussy was red from the intense arousal she had clearly been experiencing up until recently. Her thighs glistened with sweat and her landing strip showed small flecks of white in it. Out of her dripped a residue of cum, puddling slightly on her couch. Her piercing an eye-catching glint of metal among the flesh.

Madison gave a sheepish grin, too tired and glowing too brightly from post orgasm bliss to care. “Sorry doctor, I resisted as best I could.”

Before I could even fully collect myself from the sight, I heard the sound of the kitchen faucet turning off and around the corner walked Jeff. Fully naked. Hard cock still glistening with Madison’s pussy juice, glinting in the apartment’s lighting. His enormous penis standing perpendicular to his body, with each step it bounced slightly, giving an instinctive impression of its weight, and heft.

“HOLY FUCK YOU TWO!” I yelled as I covered my eyes, finally overwhelmed with the embarrassment of the situation. Jesus Christ this medicine could cause immediate over population if it makes everyone fuck like these two.

“Put some clothes on for god’s sake! We have to get to the Medical Research Center right away! Didn’t you see my texts?” I added in resigned frustration. I suspect I know exactly why they didn’t get those texts.

“Heh, sorry about that. Madison was uh… showing me something, and we got… distracted.”

I just shook my head silently as I very carefully opened my fingers enough to get another look at Jeff’s cock. Madison is a lucky girl, that’s for sure.

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“We are concerned with Jeff’s safety.” Cathy explained as Madison and I road in the back seat of her car. After Cathy had arrived and caught Madison and I still undressed from our fourth (or was it technically the fifth?) round of sex we quickly got our clothes on and calmed down. My penis, thankfully, had enough shame to go soft and things were mostly normal now. I did catch a glimpse of Cathy looking through her fingers at my cock, and that realization sent my genitals stirring, but I was able to clear my mind of such fantasy.

“I spoke with some more experienced professors in the department about this rebound affect. Don’t worry, I spared them the specific details.” Cathy continued.

“Thank you” I said as Madison made a sound of derision. As if being shy about going on a hedonistic fuck fest all across campus was nothing to be ashamed about.

“What we believe is happening is that the medicine is interacting with the parts of the brain that control arousal and sexual satisfaction. The intention was for the medicine to temporarily heighten arousal and sexual function, but then self-extinguish when orgasm, or a couple orgasms, was achieved.” Cathy explained as we turned onto the main campus road. It was still incredibly late, now technically Saturday morning, so the roads were completely empty. The campus buildings all sat in silent darkness, almost eerie.

“We think what has happened with Jeff is that the self-extinguishing isn’t triggering. And instead, you are caught in a positive feed-back loop where every orgasm further amplifies your arousal and sexual function. Effectively turning you into someone incapable of being sexually satisfied, while your body is producing excessive sexual hormones and driving you towards incredible erectile function and enormous seminal fluid production.” Cathy explained.

“And his cock is getting bigger” Madison added.

“Is that so?” Cathy asked, though she seemed only mildly surprised to hear it.

“Oh yea,” I started to explain “My dick has grown about an inch in length. Probably more girthy too.”

“It certainly felt girthy” Madison said with a wink, leaning over and reaching towards my –

“Hand Check!” Cathy yelled from the front of the car, looking into the rearview mirror at the two of us. Like scolded teenagers we both raised our hands to be visible, with Madison sliding back over to her side of the back seat.

“There will be none of that in my car thank-you-very-much.” Cathy said. “Ok, so add inexplicable penis growth to the list of symptoms from this rebound affect.” Cathy continued after a moment. “The point is that the impacts of this are going to increase more and more in severity and danger to Jeff. He already has to consume an enormous amount of water – which his body is converting into ejaculate at an inhumane rate. The danger of dehydration is very real.”

“Heh, I believe it. I feel like I’ve shot all the water I’ve ever had in my entire life out the tip of my penis tonight.” I said in agreement.

“Gross.” Cathy said from the driver’s seat as Madison snickered.

“The bottom line is,” Cathy continued her explanation “we think we have a solution to the problem. But we need to get to the Medical Research Building and my lab equipment to be safe. If we can’t stop the rebound affect tonight, there could be serious medical ramifications for Jeff. Including, I might add, permanent damage to your penial and sexual function.”

“Uhh… lets not have that please!” I said, feeling the gravity of the situation land on me.

“What a fucking waste that would be. This guy rung my bell 10 different ways before I knew what was happening.” Madison explained like she was reading a weather report. Cathy made a face from the front of the car. “Hey, it is what it is. You should have heard us.” Madison said.

Cathy’s face turned a deep shade of red, as we pulled up to the research building at last.

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Cathy’s high heels clicked on the sterile tile floor of the universities state-of-the-art Medical Research Building. Jeff and I followed her through the twisting halls. After working with Cathy for much of the last semester, I knew my way through most of the building. But we were stopping off at a few other Professor’s labs and offices to grab notes and supplies, Cathy had explained. And she hadn’t trusted us to be left alone.

I would have protested at being treated like misbehaving children, but she had a point. Jeff had fucked me silly and after every tidal wave of ejaculation was cleaned up, all I wanted was more. Even now, as I walked behind Cathy my pussy ached and everything seemed arousing. Erogenous. Phallic. The smooth polished metal lab door handles just made me think about how good that cold metal would feel sliding between my lips, with Jeff’s huge cock in my mouth.

Oh shit, is this stuff contagious?! I thought to myself. Not once did Jeff and I use protection, his extreme hyperspermia has clearly rendered him sterile… I assumed. And medicine like this wouldn’t be transmittable… would it?

“Doctor Bellechatte um… could this rebound affect that Jeff has be like… passed over from sexual contact? I’m feeling… horny. Really horny.” I said, the nervousness in my voice starting to show.

“Please, just Cathy. And no, you’re just always horny Madison. You told me about your clit piercing within the first hour of your first day. Try not to get ahead of yourself.”

Oh yea. I thought about it a moment, looking around some more. She was right, I had fantasized about those door handles before. I’d gone dick crazy in the past, just rarely with a dick that could actually keep up and pound me as well as Jeff had. This was nothing unusual.

I smiled, recalling some of the finer moments of the night. Like when Jeff had put my legs on his shoulder and fucked me so deep, I thought his cock was going to come out of my mouth. Or when he had cum while standing over me and the splash of his hot jizz on my tits was so big I could feel the impact like someone had dropped a bucket of water on me. Or the time he bent me over the couch arm, pulled my hair and –

What a great night it’s been! I thought as we finally turned towards one of the testing rooms. The big room I’d never been in before. I was starting to guess what Cathy had in mind, and her short skirt and tight blouse made more sense now…

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I was starting to be concerned that this procedure Cathy was going to perform would be painful, perhaps even dangerous. Madison didn’t seem worried, but I guess she wasn’t the one that was going to go through it all. Cathy had picked up some syringes, medicine vials, a few notebooks, and a big set of keys as we marched through the building. Everything was empty and shut down for the weekend, on top of it being almost 3:00 AM.

I was so anxious that I almost didn’t notice what was literally staring me in the face:  the incredible figure on Cathy. With each step her ass bounced nicely from one side to the other, her tight skirt and fitted blouse emphasizing her plump ass. Her long legs looked great in her stockings, and although I couldn’t see it right now, her chest looked like that of a Greek goddess. Impossibly full and round, yet incredibly perky.

Did she always look this good?

The last ~18 hours had been a blur, and the mental images of moments I hope to never forget were piling up, but I recall Cathy being dressed a lot more modestly the last time we saw each other in this building. Wasn’t she at a conference before picking us up at Madison’s apartment? Maybe these academic conferences weren’t as boring and stuffy as I assumed?

Cathy stopped in front of a set of double doors that had the sign “The Facility for Utilization of Controlled Kinesiology Research and Medicine” and unlocked the door with the keys she had picked up. She held the door open and waved Madison and I through, closing the door behind her as she followed, flicking on the lights.

My anxiety about what was to come, and my thoughts on Cathy’s body and odd wardrobe choices immediately left my brain as I took in the very large room in front of us.

It was like a huge sterile warehouse with a bedroom built into about 2/3rds of it. A large made-up bed, with mirrors on the ceiling above and a night stand filled with lube and condoms sat in the furthest corner. Large eye hooks were imbedded in the wall above the head board, and a full-sized book shelf immediately next to the bed was filled with sex toys. Vibrators of all shapes and sizes. Some with remote controls. Some small and delicate and some that you would likely feel the vibrations from across the room. Dildos of both natural colors and proportions along with technicolored alien shaped ones sat on another shelf. Anal toys, Ben Wa Balls, auto strokers, fuck machines, clit suckers, and fleshlights filled the shelves.

Next to the bed hung a sex swing from the ceiling. A pully for easily adjusting the height built into the supporting ropes. Hanging on the wall opposite the bed was a huge flat screen TV, currently displaying the feed from a camera sitting on a tripod pointed at the bed. Under the TV was an impressive array of multi-media tools:  GoPro and steady-cam attachments for hand held filming, along with some small, unusual attachments I didn’t recognize. The lighting in the room was professionally done, like a movie set.

The space in front of the TV was filled with a large area rug, clearly an intended open space for whatever this room was designed for. Finally, taking up the last wall space in the large room was a big couch with plenty of room for 4 or 5 people to sit on at once.

“This testing room is where we do the most invasive tests when it comes to any projects that need to film, or otherwise observe, authentic sexual intercourse. You’ll see the three most common locations people have sex are provided:  a bed, a couch, and an open space on the floor. The room is stocked with anything a couple might need and there are extra security measures insofar as discretion and privacy for this facility.” Cathy explained as she walked into the room and took her coat off, hanging it on a hook near the door.

“Our university has a professionally outfitted and resourced sex cave!?” Madison asked, clearly in awe at what she saw.

“I think you mean professionally outfitted and resourced Facility for Utilization of Controlled Kinesiology Research and Medicine. And yes, we do.” Cathy answered.

Before I could really grasp the implications of this room, Cathy pulled out a syringe and the vials of medicine. “You are going to take this, which will hopefully help trigger the self-extinguishing to kick in and get Jeff out of danger.”

“This will help calm things down?” I asked as I offered my arm for Cathy to quickly inject the medicine.

“No, quite the opposite. This will help amp things up even more, make sexual arousal more intense and sexual pleasure more… well, pleasurable.” Cathy said as she gave Madison her dose. “We need to push you even further to stop this positive feedback loop. And we need to do it sooner rather than later.” Cathy finished before finally injecting herself.

I could feel a small warmth starting to grow from my arm where the medicine had been injected. Maybe it was the rush from the wild whiplash of what I had just heard, but I started to feel a little light headed. At the same time, a sense of a calm, pleasant tingling started to lightly cover my body. A smile broke out on my face.

“Uh, so… what now?” I asked, looking into the eyes of Madison who stood before me, an expression of similar relaxed happiness on her face. Without comment, Madison used both hands to remove her shirt, and a heartbeat later, she took her bra off too. With her massive tits released, Madison walked forward and, while kneeling down in front of me, unbuckled my belt and helped me step out of my pants and underwear, leaving my cock bare and at perfect mouth height.

At the same time, I felt another set of hands reach from behind me and help take off my shirt. Now completely naked, I felt Madison's mouth gently work its way onto the head of my penis, slowly enthralling more of my cock. I felt the warmth pleasantly working towards the base of my shaft, as she took her time to slowly build up to my full length. My whole body shivered from the feeling of it, my brain hyper focused on the sensations and the pleasure I was feeling.

“Have you ever had a threesome before, Jeff?” Cathy’s voice whispered in my ear as I felt her hands running up and down my chest, lightly teasing my nipples as she bit my ear lobe. Her hot breath on my neck. I couldn’t turn my body as Madison’s mouth was wrapped around my cock, but I reached behind me to feel Cathy’s hips. But instead of feeling the fabric of her short skirt or sexy blouse, I felt the lace of her garter belt and the skin of her bare ass. The realization – along with the feeling of Madison’s tongue on my cock – had a warm wave of pleasure reverberate through my body.

“I can’t wait until I can show you what fucking a real woman is like”