Heavy-Hanging Fruit

Recently, My Sister is Unusual – Season 1

Mitsuki and Yūya are both locked in the bathroom naked?! The one who saved them was Kiritani Yukina, aka "Yuki-nee", Yūya's childhood friend who moved back in next door. With the appearance of a powerful rival who's an older woman, a childhood friend, and has big breasts unlike Mitsuki, Hiyori panics.