Rei, a recluse girl, is constantly subjected to sexual abuse by her stepbrother out of obligation. "Lanchin, since you can't go outside, let me take you shopping instead." He smiles sweetly while asking for something in return. "Since I did you a favor, why don't you make my dick feel good...?" His hardening member grinds against her, arousing him further. He plans on staying in the room until he cums. Everything has become too much trouble, so she reluctantly accepts her brother's demands. However, as his lust escalates, things begin to spiral out of control...