bl manga where mc is spying on ml and he sees that ml has tattoos on his body and he started to touch himself but what mc didn't know was that ml is touching himself to pictures of mc and ml knew that mc was watching him and ml confronts mc in school
Sounds like this one
https://www.mangago.me/read-manga/te_wo_nobashitara_tsubasa/
i was reading this but stopped at chapter 5 because no updates and i justed remembered it today. its been so long since my last read that i forgot the plot