Overview

My parent's remarriage suddenly gave me a gal sister like me who is a secret person! Moreover, my room is the only one for the children, so we have to share it. Huh, I'm worried... In a room full of nerds, the hurtful words, "Dassa..." But this older sister was actually quite a tsundere! She's such a little devil that she made me put down my brush as if to make fun of my virginity, and she started sucking my dick when my parents weren't around! An older sister (gal) and younger brother (otaku) with different clothes, personalities, and hobbies live together in an incestuous way!