During her girlfriend's return to her hometown, she was seduced by her girlfriend's older sister for four days. (Matsumoto Riho, BF-711)

The day my girlfriend went back to her hometown, her older sister came. She said my girlfriend wasn't home, so today was the only day she wanted me to be her boyfriend, and we went shopping together. Our bodies were pressed close, our faces almost touching. If I accepted her sister's advances, everything would begin. But, if I were tempted by those big breasts... I couldn't resist anymore.