I'm betting that the shark bro was such a chad at high school, that he just sourced all of those weird expectations from his history without a second thought.
"Wait, you've known her for whole weeks and haven't boned her?"
Never understood why anybody cares about girls measurements. Like, you've seen them in person... how do the numbers effect that? The only reason you need to know a girl's cup size is if you're gonna buy her a bra
While I understand that there might be a wide age gap, why wouldn't I be surprised if the little sister ended up with the older brother in a future to be hold? Given then a bunch of years while watching over the main cast's relation and they would find many affinities together, right?
its cool how the official localization instead of "Big Brother" they leave it as "Oniisan" same with "Aniki"
also nice change of pace usually the siblings in anime/manga are "protective" but this time he approves and recognizes he's a good guy, these chapters go by very fast lol