My mother slept with my best friend.

Ms. Asahi lives with her son while her husband often goes on business trips and returns home only after several months. One day, her son brought a classmate home. He was a seventeen-year-old guy but muscular and well-built. His appearance attracted Ms. Asahi, and she secretly wished to bed this young man. Then, while her son went outside, she tried every way to seduce this naive schoolboy.