Mei, a shut-in, is sexually abused by her stepbrother on a daily basis. "I went shopping for you, Mei." Her brother, who smiles servilely and treats her kindly, always wants something in return. "I ran an errand for you, so please make my penis feel good..." Her brother rubs his hardened crotch against Mei, becoming aroused. He intends to stay in the room and whine until he makes her ejaculate. Finding everything too much of a hassle, Mei accepts her brother's request. However, her stepbrother's sexual desire gradually gets out of control...
