Mother and son have sex in 2 seconds after father goes out

While Yui's husband was on a business trip, he ended up having an affair with his only son. Even though I knew it was not possible, my body couldn't stand the loneliness. Their rotten relationship continued quietly even after her husband returned from his place of work alone. Yui is worried that her husband will find out when she is. However, my son was enjoying the thrilling situation. Before long, Yui's husband leaves and soon gets attacked by her son...