Arai Yuka Arai. But in front of her little brother, she's a mean older sister who uses her chin to jerk off! Yuka is mean to her little brother by showing him sex and licking his friend's balls, giving him a blowjob, filming him while she gives him a sex report, letting him peek at her in the bath, and having an ostracized threesome. Even though she confessed her love to him and even had sex with him for the first time, she just keeps doing things that make him jealous. Will this siscon little brother be able to be with his beloved older sister...?