Sex Study Week 3: Lend me a Handjob

The next week I went back to the medical building at the usual time, and Jack was there waiting for me. He was only wearing a pair of tight black briefs, which was a little weird, but it didn't bother me at all. I mean, I'd already seen him naked and stroking his cock, so seeing him in his underwear was no big deal. I have to say, though, he definitely filled them out nicely. His ass was full, round and all muscle, and the bulge in front was almost obscene.

"Hey buddy!" he greeted me. "Ready to go? I thought I might join you again if that's ok."

"Yeah, no problem. Just give me the mp3 player and I'll strip so we can get going."

I quickly got nude and laid back on the couch before putting the earbuds in. After I had them in, Jack slowly hooked his thumbs under the waistband of his form-fitting briefs and pulled them down almost seductively, like he was putting on a show. After he sat down I realized I had been staring and blushed a little. I put on track 3 and started stroking.

Like the other two tracks, I couldn't hear any actual words, but there was sort of a whisper in the background that I knew must be what they were testing on me. The audible part of the track sounded like a flowing river with the occasional bird chirping in the background. Jack and I started stroking at almost the exact same time, and this time I didn't close my eyes while I listened to the file. For some reason I couldn't take my eyes off of Jack's 10-incher. There was a thick vein snaking down one side that curved around the bottom and went down into his massive balls, and the head was huge. It surprised me that he hadn't been getting laid lately with a hot cock like that.

As he stroked, I could see it throb, and it was getting me even more turned on. I think I was fantasizing that it was my cock (even though mine is pretty big too) and that it my was my big, muscular hand that was stroking it. I felt myself lick my lips.

Jack started stroking his cock faster, and I did the same. He grunted, and I felt my cock get a little harder in my hand. It must have been about twenty minutes that I'd been staring at Jack's cock as we both stroked, but I really had no idea. I was just so lost in the sensations. Right as I felt my own balls begin to tighten, Jack shot his load. It was huge! I thought I was cumming a lot since starting this study, but I had nothing on him. He shot at least seven massive strings of cum, and the last two landed on my abs and my cock. It was warm and sticky. I just kept stroking, not even caring that another man's cum was all over me, and it wasn't long at all before I shot my own huge load all over my stomach.

I sat there recovering for a minute before I noticed jack standing over me, his cock still semi-hard. He reached out his hand to help me up off the couch.

"Sorry about that," he said. "I've been really horny lately, so my loads have been extra big. Didn't mean to cum all over you."

I just laughed and told him it didn't bother me. I showered quick and told Jack I'd see him Thursday. On my way out, he gave me a playful swat on the ass.
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When I got there on Thursday, Jack was there in his underwear again, only this time he was wearing a standard jockstrap. I started stripping right when I walked in.

"Hey Jordan! Glad to see you're ready to go." He laughed.

"Easiest money I've ever made," I quipped back.

"That's the spirit! Alright, just get yourself settled but don't start the file yet. I want to start on the next step of the study. When I say so, start the file and close your eyes, but don't jerk yourself off. This time, I'll be the one stroking your cock. Sound ok?"

This was the part that had made me a little uncomfortable when I first signed up. Having another guy rubbing my cock wasn't really my thing, but I was getting paid to participate. And besides, now that I'd been here a few weeks, it didn't sound so bad.

"Yeah, sounds cool."

I laid back and closed my eyes so Jack cold do his thing. It was weird feeling a strange hand jacking me off, but it felt good. Obviously, Jack was pretty skilled at masturbation, because I was rock hard in like two seconds and I stayed that way the entire time. I tried to focus on the whispering in the file, because I was curious about what they were saying that would make me cum so much harder than I used to, but it was always just beyond me. Eventually, I gave up and just focused on the pleasure of getting jacked off.

I could hardly believe it, but I came harder and shot more than even the last three weeks worth of this study. How the hell were they doing this? It was definitely hot, but damn if it didn't shock me that my sex drive could keep going up and up.

"Whew," i sighed. "You're really good at that."

Jack smirked. "I've had a lot of practice. Why don't you get cleaned up and then come back out here. I want to talk to you about something before you leave."

I did what he asked and in a gew minutes I was back by the couch, fully clothed.

"Alright, Jordan. First, i want to say that you're making amazing progress with our program. All of our hypotheses are proving true thus far. Second, I wanted to let you know that we won't be having a session on Saturday. I'll be out of town, so I'm not making anyone come in to work on this. However, I still want to make progress, so I want you to take the mp3 player home with you for the weekend. If you want, you can listen more often than just on Saturday, but do not, under any circumstances, skip ahead to any of the further tracks. Is that clear?"

"Yeah, I think I can do that. Track 3 and jacking off. Should be easy enough."

Jack smiled. "Good man. Alright, since you won't be coming in on Saturday, here's your $2000 for the week. I'll see you on Tuesday."