Responses
thats kinda hot
Doseiai no Pati de Mottomo Miryoku Tekina Ochinchin, maybe? there is a scene where they’re at a pool/gay hangout spot and they fuck lol
http://www.mangago.zone/read-manga/free_kisses/
This is probably not it because you said it's a one shot~ But it sounded like a chapter from this.
What’s that one yaoi where it’s like two people at a pool or water park and like one of them is wearing a speedo and they have sex, it’s a one shot... sorry that’s kinda vague