Responses

Especially in a place like Japan where homosexuality isn’t discussed and accepted as much I can understand why the brother would feel anxious about his boyfriend and brother meeting and especially in a situation that was sexual. I also assumed that the big bro would be PISSED about a guy doing such things to his precious (thankfully he was very understanding) Yuki, so of course yuki would assume the same considering how overprotective the big bro is.
The Lil brother's lover ran away when found out by his older brother. That tells a lot about the lover. I couldn't help but kind of hate his gut for it. I had wished that Yuki would at least tell his brother about having a lover. Bringing someone home and having intimate time without your housemate's consent is a bit ludicrous and inconsiderate.