
I really dont understand how you confused this with yaoi with a girl right in the center of the cover and no yaoi tag but I will try to help.
Not sure what you looking for but I guess one of those yaoi could be it:
Just porn, don't search for meaning
https://www.mangago.zone/read-manga/let_s_go_to_the_gym/
It starts funny but he has fun and it has a cute ending. Mostly just porn
https://www.mangago.zone/read-manga/rough_uniform/
All I remember about this one is finding it funny
https://www.mangago.zone/read-manga/boss_it_s_not_a_massage_parlour_ssfujoshi/
I think it's close to what you want
https://www.mangago.zone/read-manga/link_in_the_hole/
Bara about turning hetero men into gay
https://www.mangago.zone/read-manga/priapus/
Messed up kinks. That's a good summary.
https://www.mangago.zone/read-manga/screengrab/
I like this story and seme used to be hetero
https://www.mangago.zone/read-manga/therapy_game/
I have been yaoi baited and hooked and trapped and caged and ready to be scaled and gutted to be served but no one's reeling me in... I'm gonna be shameless now but please can anyone redirect me to something similar but where the guys actually at least touch each other. I'm ctfu