One night and two days of 1 night and left alone by my wife's sister who suddenly came over

"You had a fight with your sister, haven't you? I'll help you make up." After a couple's fight, their wife returns to their parents' house, and their sister-in-law Mako comes to help Koji, who was depressed. Koji gives his heart to Mako, who gently comforts him. However, Mako's true goal is Koji's cock. That night, Mako's evil hand reaches out to Koji, who is taking a bath. Koji desperately tries to suppress his desires as he feels his plump breasts pressed against his back...