[M4F] Revealing outfit at the gym

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Today me, a fit 41 male from Italy, is coming to the gym as usually, but due to the rush from work I didn't quite had the focus to properly fulfill my bag. It's only once arrived in the locker room at the gym that I notice I forgot a clean pair of underwear.

"Goddamnit" I curse whispering among the other men changing and getting out. Is kinda late, around 9 pm, and at this time usually there is not much people. After few seconds of thoughts, I still have to take the decision: should I train myself keeping my underwear under the shorts, but then I'd have to wear the casual clothes without it since they'll be all sweat, or the other way around? Then i remember I'll have to meet up briefly with a friend of mine at the pub, with the casual clothes and the short shirt I'd feel being on display all night there...

Thinking that the gym will be almost empty, I take the difficult decision of just training without the undies, thus I wear the grey short pants and the gym fitness shirt and get out the locker room.

I spot few people here and there and I feel already quite embarassed. I can sense my cock bouncing evidently left and right under the thin fabric of the shorts, but I hope that anybody would just mind their business there, and eventually just get out one by one since it's already late.

Once I reach the treadmill, tho, I spot you, stretching not too far. Classic yoga pants revealing your round prominent ass and a white top with a modest cleavage. As I start running, you are basically in front of me, and I can't help but glancing at you, trying to stay chill...

This is roughly the premise, of a situation I experience more or less on a daily basis as a gym enjoyer. Feel free to propose any change or modifications