Yuri's son has always loved his mother's big butt since he was young. Taking it to the extreme, he would apply oil to his sleeping mother's butt and press his penis against it while masturbating. Yuri also had a strong sexual desire and masturbating with vegetables in the kitchen was part of her daily routine. Her son had been spying on her. One day, her father, who had been working away from home alone, was due to return after a long time. The son, not wanting to lose his mother's butt, attacked Yuri from behind. "Mom's butt is mine. I don't want to give it to anyone!"
