OK, I'll tell you one of my favs...its two males so you straight men just hold tight I'll give you one about a female subject later.
This happened several years ago now (wow, how times moves on!). I was working at a university as a coach. Periodically, I would put a personal ad looking for a nice body to work on for massage. I had long since given up trying to do a massage business and instead looked for bodies I'd want to give free massages to.
Well, one day, as luck would have it, a guy responded who claimed to have GREAT stats and after some back and forth with pictures, came over. He made sure I knew he was straight and that he was just looking for a good massage, and because he was a student, didn't want to pay for one. I knew who he was because I'm really involved in the swimming world and this was a world-class swimmer (no, it was not Michael or any of the super famous ones...but he is an Olympian, and a medal winner). I could tell he was really nervous, so I tried to be as open and friendly about it and said it was not going to be anything weird, I promised. Well, he took his clothes off and let me just tell you, this guy was SMOKIN' hot. He was very tall, about 190 puonds of the leanest muscle possible. You could see his 8 pack while he just stood there, looking at me, his 6 inch soft uncut dick hanging just a quarter inch below his low-hanging sack. It was one of those take-your-breath-away kind of moments for me. And it was REALLY happening...I'm not making this up!
So, he lays face down. I'm telling you....what a site. He had those typical broad swimmer shoulders that V'd down to what I guess was a 30 inch waist. Just the site of his ass made me stop breathing for a second. His tanline very visible now that his hot little white ass with just enough hair in the lower part of the crack was right there in front of me. His butt cheeks were perfect, no bumps or unsightly pimples...and so little when compared to his super broad upper back. His skin smelled like chlorine so I knew he had come from a hard workout.
I didn't use a drape, and after probably 15-20 minutes I could tell he completely relaxed and we enjoyed each other's company. Let me just tell you I worked those perfect glutes to the best of my abilities...never anything that crossed the line, but I did get to see inside his slightly hairy crack and when I did some of the leg stretches I noticed some precum marks on the table sheet.
Well, I worked on this prize winner for about 2 hours. I never crossed the line...I told him nothing weird and he said he was only there for massage and he got a good one. He got dressed, thanked me and left.
Well, life went on and about 3 or so weeks later he contacted me again. Said he wanted another massage and was I available in the next day or two. Of course I was!
This time, the energy was different, something I'm very tuned into. It was about 80 mins or so into it, he was on his front at this time and I had done the legs (god, what incredible quads this guy had), arms, chest, and was working on his ripped abdominals. His cock started to swell just a little bit. A normal thing. Well, I was doing a release move in the lower quadrant of his abdomen, and he then got rock hard within a few seconds. What could I do? Here was this God-like idol, on my massage table, hard as a rock and completely relaxed. I took his now 8.5 cock in my hand and started to stroke it. He didn't stop me so I went down and licked his low hanging nuts. Then I pulled his foreskin over the glans and put it in my mouth and let the skin slide down as the head of his cock was in my mouth. He then propped up onto his elbow and watched with a look of what I can only describe as bewildered horny excitement as I sucked him off. It was only about two minutes later that he said he was going to cum so I used my hand to finish him off and he came all over the sheets.
Of course, the energy immediately shifted, he got dressed and left. A couple days later we exchanged emails again and he said he felt weird because he was straight and never did anything with a guy before and obviously he liked it but he was straight and it was just weird.
We got together several other times for massage after that time, and they were great sessions, without any sexual energy, he appreciated my skills and I appreciated his awesome body.