Ai, the mother-in-law living with her daughter and son-in-law because her husband is on a solo assignment. It's a peaceful daily life, but she had been releasing her loneliness without her husband every day through masturbation. One day, Ai found out that her son-in-law Ichiro was peeking in on her... She was captivated by his big dick, and somehow she even started to think that she wanted him to use it on her. And when she found out that her daughter was sexless, she approached him seductively with her proud K-cup breasts and continued to tempt him day and night...