When My Little Stepsister Watched My Wife Cumming Like Crazy, She Decided To... Nao Jinguji

Nao, who had been living an otaku life in the countryside, moves to Tokyo right after graduating college. With no job or apartment, she ends up staying with her older sister and brother-in-law until she finds one. But the intensity of their nightly activities shocks Nao. She peeks at her sister's violent thrusting, scream-like moans, and arched body reaching climax again and again, and can't help but get wet. Unable to contain her overflowing desires, she takes bold action...