Came up with a headcanon recently that Kounosuke grew up to be a Fun Gay Uncle™️, while his little brother Yukiharu is a more mellowed out recently-married straight dude who lives in constant fear of his brother showing up and telling everyone embarrassing stories about when they were kids; Yuki still has to keep inviting his brother over, though, because the wife thinks he’s great and he always agrees to help babysit in a pinch.