A 40-year-old mother with a big butt who came to her son's room in Tokyo from her parents' house in Morioka, Iwate Prefecture. Her undressed figure, changing clothes in the room as if she were at home, is so captivating. Her son, who can't help but be bothered by her plump breasts and protruding full buttocks, can't stand it anymore... With a long-awaited reunion, the skinship between mother and son stirs up their sexual desire, and they fall into lewdness!