My Curious Urologist, Part 7

I got up on the table and lay there naked (as Jessie suggested) while she wiped up the mess on the floor. I watched her big tits sway back and forth as her arm pushed back and forth across the puddle of pussy juice she had gushed. I was still remembering how good it felt to be inside her warm, eager pussy, and how great it was to squeeze her big tits (as well as squirting another hot load into her mouth). Wow, I had fucked a hot, young clinic worker, and she couldn't get enough of my cum! She swallowed it all.

As sexy as it was to watch this naked girl clean up the floor, my penis was so exhausted, it shrank back to its normal, flaccid size as I recovered from our surprise intercourse. I assumed that Jessie didn't fuck every client who visited the clinic.

She got the floor clean and then came over to get me off the table. We barely said a word as she brought my underwear, then my pants, then my shirt ..... until I was fully dressed. She had squeezed my soft penis as she put it inside my underwear, but it seemed like she was just checking. She pulled me to the door, and just before opening it, she leaned in close and said, 'I love your cum. Please come back for more tests."

She led me to the waiting room, and Erin was sitting behind the desk. She smiled and motioned me over. I was still in a daze as I stood in front of her desk. 

"Do you want other studies? We have an anal study next week," she asked matter-of-factly. Her knowing look reminded me that she had just had her finger inside my butt, had squeezed my balls, and watched me cum in Jessie's mouth. Did she want me to come back so she could play with my anus some more?

"Um ..... I don't know. What is the study about?" I asked with some interest. I had actually enjoyed having my anus stretched.

"Hmm, let's see. It's for men with strong ejaculations ....... if you donated half a cup, I think you qualify," she said with a smirk. She continued with, "They stretch your anus with various dildos, observing how wide you can get before you ejaculate. Does that sound like something you're interested in?" she asked as if she was telling me about a library book that might be of interest.

"They stretch my .......... I think I got enough of that today. Why would I want a bunch of dildos up my butt .......?" I pondered as I tried to imagine a big dildo up my ass. Hadn't the speculum opened me wide enough?

"Well, it's up to you. There are only a few slots left open, and it looks like Jessie is leading one of them."

"Yes! That one!" I blurted as I jumped at the chance of being with that big-boobed, cum-loving girl again.

"You want ...... which one is it ....."

"The one with Jessie! That one!" I said quickly, wanting to have more time with that sexy clinic worker.

"Oh, 'cause she sucked your ........ I think they have to measure your sperm, so that won't happen again," Erin said plainly. She looked at me as though I was a disgusting person for enjoying cumming in a sexy girl's mouth.

"Um, that's alright .... I don't mind. I'll do the anal study if Jessie's in charge," I answered, wondering what I was getting myself into.

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I showed up to the clinic the next week with visions of sexy Jessie playing with my asshole and making me cum. I had refrained from jerking off for three days, just to make sure she got a large sample. I had also squirted some water up my anus, wanting to be clean for this 'anal' study.

Erin was once again at the desk, and I was soon after I arrived, Gemma poked her head out of the inner door and said, "Mr. Johnson?"

It was nice to see her again, and her smile put me at ease. I followed her to a small room, and she was business-like as she said, "It's nice to see you again, Mr. Johnson. You need to take off all your clothes."

I complied, and was soon naked in front of this girl who had stretched me with the speculum before. She barely looked at me as she said, "Now, you need to get on the table and spread your legs. This enema won't last long."

"Oh, I took care of that already. You don't need ........."

""I'm sure you did a good job, but this study requires a deep cleaning. We are going to be probing your rectum quite thoroughly. Would you lie on your back while I ............."

"Wow, that nozzle looks longer than the one last time. Isn't it going to ..........?"

"This is so I can get into your colon. We are supposed to go deep inside, making sure you are totally clean. Just lift your hips a little so I can .........."

"Ooh, that's cold! Even the gel is kind of ........... aahhhh, you're making it ........... oh wow, I can feel it going way inside. How far does it .............?"

"Just keep your legs up. I need to go a little deeper ........... now, it might feel a little warm. I'm releasing the water."

"Ohhh .............. that's ................ hmm, it's feeling pretty full. Do you need to .........?"

"Just a little more ........ we want to make sure .................... now, just lie there with your legs up and I'll pull this out. Please hold it in while I ........."

"Oh, oh, oh .......... there's so much! I can't ............ ooohhhh!"

"Alright, get over here quickly! Sit down ............. yes ............ that's right. Are you empty now? I think you made it all gush out. Get back up here so I can check ............"

"You mean, just lay down ............... ohh, your slippery finger feels nice. How far ............... oh, that was quick."

"You look nice and clean. Please stand up and follow me."

I followed Gemma down the hall with my limp penis wiggling, knowing that my colon was completely empty. What were they planning to do to my tender little anus?

We got inside the exam room and I saw Pavel once again at the control board. I saw two sling-like stands, and Jessie was standing next to one of them. She smiled and motioned me over, and told Gemma, "Yhank you. You can get subject number two, now." Number two? They were going to be probing two anuses at once?

"Nice to see you again, Mr. Johnson. We'll try to make this easy for you. If you step near the sling, I can strap you in."

"So, you're not going to .....?"

"We need you standing this time, since we will be probing your anus while we measure your ejaculation. The easiest way is to have you upright so we have access to your anus, while your sperm can squirt out in front of you, into the trough. Would you step closer and let me wrap this around your waist?"

I silently let her strap me into the contraption, my body leaning slightly forward with my legs spread wide apart. When I was in place, Pavel rolled the familiar trough in front of my dangling penis. I couldn't turn my head very far, but I seemed to remember a table behind me with a row of ever-larger dildos on it. Was each one going up my butt?

Gemma entered the room again with 'subject number two'. He was younger than me; maybe a college student. His penis was already hard, and he looked nervous. Hey, he had agreed to this study, so what was he afraid of?

Jessie had some small-talk with him as she strapped him in and Pavel placed the trough, and then she ordered Gemma to take her place. Gemma got behind 'number two' while Jessie stood behind me and placed her warm hand on my buttocks.

"Make sure he's lubed properly. Tell me when you're ready," Jessie ordered, and I felt her slimy finger rolling around my tender anus and then slipping inside. Oh, her finger was nice as it probed gently, wiggling back and forth as she explored my clean rectum. I felt my penis getting hard as this sexy girl played with my asshole. 

"I had forgotten what a smooth one you have. Much different from 'Mr. Hairy' over there," she said quietly as she pushed deeper.

"It's tight, but I'm in," Gemma announced, and Jessie took that as her cue. "Alright, first dildo," she ordered as she pulled her finger out of my butt. She returned and pushed gently at my slippery asshole, and I felt a soft piece of rubber (silicone?) spread my anus open and slide inside. It didn't really hurt since Jessie had been loosening me up, but it must have been about the size of a normal penis. 

"Aaahhh ......... it's not going to ......... Aaaaggghhhh!" I heard from subject number two, and I assumed that Gemma had trouble getting the first dildo into his butt. 

"Alright, I'm in," Gemma informed Jessie, and Jessie responded with, "Pavel, start the clock."

I felt the dildo slide in and out of my butt, going deeper with each thrust. How long was this thing? It seemed like she was probing and moving it around, trying to find the entrance to my colon. Oohhh, she found it! Ooooohhhh, she was pushing deeper! This fake penis was going deep into my body! It felt like the dildo was sliding up my colon and stretching my insides.

"Ohhh, how is it .............. Aaaaggghhhh, that's not going to ..............Aaaaaaaaaaaaaa!" number two screamed, and I guessed that Gemma was now deep inside his colon, just as Jessie was in mine. 

Just as I was getting used to the slight stretch of the first dildo, Pavel called out, "time!" and Jessie stopped sliding the dildo. It remained in my asshole while she stepped back to get another. When she returned, she slowly pulled the 'penis' dildo out and replaced it with something much bigger. I could tell it was bigger because I could feel the new stretch of my anus. Now it was my turn to say something.

"That feels too big. You're not going to ...........?" I objected as the larger dildo invaded my loosened asshole. She slid it slowly, probing once again for my colon entrance.

"Eeeooowww! No, no, no! It's not ......... oh my goooooddd!" I heard from my fellow subject, and I assumed that the larger dildo had made its way into his tight asshole. 

"Pavel, start the clock," Jessie ordered, and she began rhythmically sliding in and out of my stretched hole. I felt it going deeper, and suddenly I felt it pushing inside my colon. This fat dildo was going way up my anus!

"Ooohhh ....... aahhhh ....... it's ...................oh, oh, oh ............. I can't .....................Aawwwaaaaahhhhhwwaaaahhhh!" number two screamed, and I looked over in time to see a huge stream of cum shoot out of his swollen dick and fly to the far end of the trough. His penis was jumping as more cum started squirting, leaving long streaks in the trough. His body was shaking as he continued to squirt, moaning softly as Gemma probed deeply into his butt.

"Time!" Jessie called out as she continued to 'fuck' my loosened hole. I could  see that number two was now just dripping, being totally drained of all his cum.

"Forty-eight seconds," Pavel called out, and I assumed they were measuring the time it took to cum while using a particular dildo.

"Alright, Gemma, let him rest," Jessie ordered, and number two moaned softly as Gemma extracted the fat dildo from his asshole and placed it on the work table.

"This one's not ready. Get the next one, please," Jessie said to Gemma. I heard her walk behind me as Jessie pulled out the fat dildo, and suddenly I felt something that must have been as big as my fist! They weren't going to stretch me that wide, were they? It pressed against my gaping asshole, trying to force its way inside. It pushed harder and harder, but my anus was not accepting it.

"More lube," Jessie ordered, and I felt the huge dildo pull away from my anus as slippery fingers spread more gel on my open lips.

"It's just gaping open. That's bigger than it was when I played with his prostate. I'll bet it can go wider. Look how red it is inside," Gemma marveled, and it sounded like she was having fun playing with my loose hole.

"Now try it," Jessie ordered, and I felt a fresh assault on my tender hole. The slippery head pushed forcefully, and I felt it stretch me open. I pushed back to open myself fully, and suddenly it slid deep inside. I gasped as I felt my sphincter relax and let this monster cock invade my body. It was like someone had their arm inside me!

"It's inside. Start the clock," Jessie barked, and I felt this huge 'cock' sliding in and out of my stretched hole. It was amazing to have my asshole stretched so wide, and I felt an excitement growing from deep in my abdomen, as if this huge 'cock' was massaging my prostate. The feeling got stronger, and Gemma pushed deep into my loose anus as I enjoyed being 'fucked'. I looked down at my straining cock, and I could see a constant dribble of precum dripping into the trough. This 'fucking' was getting pretty enjoyable.

As Gemma thrust her 'penis' deep into my rectum. I felt a warm hand slide down my tender cheek and touch the stretched lips of my asshole. Was Jessie feeling my ass-lips? Then her hand slid down to my hanging balls, and a gentle squeeze was all it took.

"Oohhhh ............ Aaaahhhhhhh!" I groaned as I felt my sperm squirt out. I watched as it flew almost to the end of the trough, splashing down as more cum squirted from my excited cock. My dick jumped and squirted, sending at least 12 big streams into the air. I thought I heard Jessie giggling as I spewed my sperm into the trough.

"I can feel him pumping," Jessie said quietly as she held my tight balls. I was sagging in the harness as Gemma kept the monster dildo deep inside me, and Jessie squeezed my balls. They both watched as a few more spurts of semen dripped from my tired penis.