After discovering her husband's affair, Miyu Morita suddenly shows up at her younger sister's home. When she learns that her sister is away on business, she decides to vent her anger and pent-up lust on her brother-in-law. She strips him without asking and overwhelms him with a filthy blowjob and titjob, then cums repeatedly as he consoles her with cunnilingus. Still aching for more, she slips into his bed that night, pulling him into hard, forbidden sex with her curvy body, huge tits, lustful stare, and relentless hips. In the end, he gives in and creampies his sister-in-law.