This manga that I've read before was about this guy
Who was saved by another guy on the subway from being mistaken a molester and they end up living together. And then the guy ends up finding out his bf used to be an old student of his back when he used to teach at a cram school, I think =? and it's an older seme/ younger uke type of manga not sure if it's a one shot or not. Please and thank you =)

Only One (MOEGI Yuu)

Thank you =)