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

After his wife went back to his parents' house, Atsushi, who was left behind, was unable to do housework and spent time in a messy house. Worried about Atsushi, my wife's sister, Sora, comes to help with the housework. Although he felt a bit guilty about inviting a woman other than his wife into his house, Atsushi's sudden visit was a great help... However, the purpose was different. This means relieving your own frustration with your younger sister's husband instead of your husband... Without realizing that, Atsushi was taking a bath, "I'll wash my back," and Sora smiled seductively in sexy underwear, and her hands touched Atsushi's back...