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

My wife had returned home with Toru left for birth. It's been a while since I lived alone, and I'm determined to play a pachinko parlor that has been prohibited since I got married, but then my sister-in-law Senna suddenly rushes over. He said he came to help Toru, who is probably in trouble on his own. As Sena was cleaning, she showed her breasts and underwear as if she was stoking, and Toru's sexual desire was at the limit. He takes a bath as if to escape, but Sena chases after him...