fills the sister cliches since they end up living together with the MC. A sexy onee-san, a loli imouto and a mother-like wife that does the cooking and controls the budget (so literally best wife). The sexy onee-san is stacked and is willing to suck his dick if that's what you're into.
I love how he's already kind of accepting that he's Ryuuga's boyfriend now. And that since she thinks he's such a pervert the more he acts like one the more she's into it. I'm sorry, but it truly is tough being a friend.
Mild spoiler
I'm not much further in the light novel, but him and Ryuuga just straight up start dating pretty quick. He doesn't even try to deny it anymore.