Due to his parents' remarriage, 'uta' and her stepbrother started living together. The rebellious girl couldn't stand her stepbrother's presence and would get irritated every time she saw him. However, being in puberty, she would masturbate in her room every day. Little did she know that this act of self-pleasure would... One day, both parents were away for three days, leaving the two siblings alone. The stepbrother had been secretly filming her solo acts and used it to blackmail her into having sex. Humiliated but with an incredibly compatible downstairs, she reached climax after climax over 72 hours.
