My sister became a shut-in during her school days. When I returned home after years away at university, she was still being pampered in her reclusive state. But when I peeked into her room, I was shocked—my sister, now with huge breasts and an enormous ass, was masturbating?! This formerly chubby, introverted NEET had turned into a sex-crazed woman! When she saw my raging erection, she invited me to fuck her!? Her 120-point voluptuous body was irresistible! We went wild all over the house—in the bathroom, sneaking around Mom in the living room! Cosplay in swimsuits and uniforms! Creampies included! I had my way with her seductive, fleshy, lust-filled body!