Movie Information:
My girlfriend’s older sister is a shut-in. Even when I see her occasionally at her house, we only exchange greetings, but she stares at me with a glazed look—she’s the epitome of a social outcast. One day, I accidentally caught her masturbating… Seeing her usually plain-clothed older sister’s sexy body—huge breasts, a slim waist, and a massive butt—gave me a massive hard-on! From that day on, we started secretly masturbating together behind my girlfriend’s back!