Three days without parents, when their brother hates his rebellious tsundere busty sister, and his older brother's super-sexual cock, makes him cum over and over again.

Uta and her brother-in-law end up living together after their parents remarried. During her rebellious phase, she was physically unable to accept her brother-in-law's presence and was frustrated every time she met, but even as she was adolescence, she masturbated in her room every day. I can't believe this masturbation was caused by... One day, the parents were away for three days and were alone with their two siblings. His brother-in-law is secretly filming one of his cheeky little sisters having sex, and uses this as a joke to force him to have sex. It's humiliating to have my dick fucked, but the mates are so good that they climax for 72 hours.