It is a yaoi manga where the uke was caught having sex in an abandoned school building by his sensei. Sensei became his friend since they somehow understand each other cuz sensei was just like him when he was still studying. At the end, sensei's lover in the past was also transferred to the same school. Thanks!
Can u guys recommend me any yaoi manga/manhwa where the seme looks like uke-ish, thanks!!!
Chapters 4, 6, 8, and 8.5 of Bousou Kareshi and kind of Ore no Ushiro no Tatsu na!!
Sorry if you don't like that kind of art style though
http://www.mangago.me/read-manga/saeki_kun_ni_tsunagatchau/ (the smaller one is probably the seme)