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

"I'm sorry for all of a sudden. Can I go up?" While my wife's home, my sister-in-law, Akari, came to visit me to check on her situation. Tatsuya, who was lonely and doing housework alone, welcomes Akari with joy, saying that he has got a talk to him. Tatsuya frightens Akari as he comes into contact with her strangely close. Just being stared at by her lovely beauty makes me feel aroused. She soaks in the bath to calm her mind, but ends up having a mixed bath with Akari, who has come to wash her back...