looking for a pornhwa, it’s about swimming or something I forgot…

Maybe?

https://www.mangago.zone/read-manga/three_dive/ https://www.mangago.zone/read-manga/flip_turn/ https://www.mangago.zone/read-manga/dangerous_love_affair_in_the_boys_swimming_club/

pornhwa is like straight porn

this?
https://www.mangago.zone/read-manga/in_at_the_deep_end/

Ah sorry I've seen that term be used for yaoi as well. Hope you find it.