They are in relationship so the possibility of being intimate is 100% so that is why. I know momo is a guy but they have been together since they were young and iroha thinks of him as her younger brother while uncle also think the same but the only thing is that uncle doesn't know momo likes iroka but still he shouldn't do that because both are teenager and things can happen even if they think of each other as a siblings. Uncle is discriminating
the uncle and the childhood friend are irking me off, and thinking how this might lead to another unnecessary jealousy misunderstandings quarrel or idk (just hoping it will not but) is seriously gonna make me tired I mean don't make this an another cliche childhood dumb shits..
the last two panels tho, I don't know what to feel lmao I mean.. 'kay