JUMP-4047 — My Brother Is My Onapet #7. Shuri-Chan Shuri Atomi

Shuri, a cute girl like a doll, has a perverted brother who has never been to school, always hiding in her house and peeping on her masturbating or having sex with her boyfriend. One day, he sneaks into Shuri's room to try to have sex with her at night, but is found out. From that day on, the brother becomes his sister's slave, and it seems that his sister forces him to perform cunnilingus on her like a butter dog on a daily basis... Such a brother and such a sister!