BLK-627 My lewd cousin sister

When my parents remarried, I suddenly had a little sister! Furthermore, since my room was the only child’s room, I decided to share it. I was worried... One hurtful word, 'Dassa...' in a room full of otaku. But this sister is actually a tsundere! I'm still a virgin, and I'm too small to be a broom for her to mock me, or for her to suck my dick when my parents are not around! A big sister (Gal) and a little brother (Otaku) with different clothes, personalities, and interests living together in a kind of incest!