Donuttouchme

Im looking for a compleyed manga about a black haired teacher and a light brown haired student (its a yaoi). I cant remember a lot but it was emotional and had really nice art. This is sooo vague but i appreciate your help :)

Hey, I need help finding this yaoi and all i remember is a scene where the uke and seme go to a beach with other friends and the uke "accidently" loses his shorts, so the other friends start looking for it, meanwhile the uke and seme can have sex in the water.
Would really appriciate it, thanks ヾ(❀╹◡╹)ﾉ~