Dawrg's question (2)

Im trying to find this bl where these two delinquents are rivals but then right before a fight one guy needs to uhhhh take a dump and the other rival catches him making a cute face while in the restroom and falls in love with him..i swear i remember it being wholesome n goofy thats why im trying to find it

This has been bugging me for awhile please help

Any gl similiar to define the relationship, the third ending, semantic error or like blue flag?? Tyy