I know this sounds crazy but is 100% true. Happen to me last week in a yoga class I was in. I was up at the front, wearing black soccer shorts and a t-shirt, but forgot to bring underwear so I was going commando, which can get pretty obscene if I am not careful, but NBD, what can you do. It was a substitute teacher, he was this older man, straight seeming dude in his 60's. He looked like he took care of himself, had a Paul Newman thing going on.
At some point he needed to do a demonstration of one of the poses, he gestured at me to come up. We were all bending forward and he had his hands on my lower back to show how to lean into the pose, all fine. Then as everyone bent over he put his hand on my ass(!) It was sort of in keeping with the pose alignment, but I noticed he waited until everyone's head was down to do it. If it had been a woman it would have been fucked up, but I didn't give a shit. I actually thought it was kind of funny. Old dude trying to perv on the young stud.
I got back to my mat and kept going. Eventually he came by my mat as we were doing another forward fold with our legs spread wide. He came by and helped 'realign' me again. My legs were spread open as I leaned over and he pushed me in the right position. Granted, I am not a yoga master yet, so I do need help, and usually love it when a cute girl teacher gives me a nudge. But this was different power dynamics when the one in power is a dude. As he pushed on my ass with one hand he reached between my legs to spread them out further and brushed against my dong hanging loosely in my shorts with the back of his hand. he stayed there for a second and let it swing like a pendulum against his hand. He knew exactly what he was doing. I let him feel it, fuck, what do I care. He must have seen it through my shorts when I walked in and wanted a feel. Haha, old perv.
We went into the final pose, shavasana, where you lay on your back for 5 -10 minutes in the dark. As I was laying there I got a huge hard on from all the attention my cock had been getting, mixed with the feel of the soft athletic shorts rubbing on my cock. Everyone was on the ground with their eyes shut so there was no danger of anyone but him seeing. My cock was getting pretty hard when I heard him walk near my mat and say to the whole class, but directing it at me, 'let the blood flow through your body to where ever it wants to go' Haha, the bastard. All 7" of me was hard as a rock after that. I kept my eyes closed but could feel him standing over me watching my throbbing cock.
The class ended and I was like a middleschooler, covering up my raging boner with my yoga mat and getting the hell out of there. As I collected my things and left he patted me on the shoulder and said 'thanks for coming in'. While I thought it was funny and really didn't give a shit about it. It was also creepy as fuck and didn't want him feeling like he got away with it and would be emboldened to do it again to someone else who might be really scarred by it. I am generally a non-violent person, but I had a good 6 inches of hight and 50 lbs on him, and can be intimidating if I need to. I turned around and looked him in the eyes and quietly whispered something to the effect of 'try that shit again fucker, and I'll brake your fucking arm in the parking lot'. Gave him my best Patrick Bateman smile, and walked out of the class.
Have not seen him at the yoga studio since, but I don't think he will be trying it on me again.