The reclusive Ran is sexually abused by her stepbrother on a daily basis. "Since you can't go out, I'll go shopping for you." Her brother treats her kindly with a submissive smile, but he always wants something in return. "I ran you an errand, so you better make my dick feel good..." Her brother rubs his hardened crotch against Ran, turning her on. He intends to stay in the room and whine until he makes her ejaculate. Finding everything too much of a hassle, Ran accepts her brother's request. However, her stepbrother's sexual desire gradually gets out of control...