Its a bl where the guy likes the guy he went to highschool with, but that guy is getting married to his previous students step sister and the guy who likes the guy from highschool starts talking to the previous students step sister
This? https://www.mangago.me/read-manga/form_of_sympathy/
Its a bl where the guy likes the guy he went to highschool with, but that guy is getting married to his previous students step sister and the guy who likes the guy from highschool starts talking to the previous students step sister