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

One day, while his wife was returning home to prepare for childbirth, her sister-in-law Saya came over to see him being in trouble. She is spoiled by the kindness of her sister who cooks, washes, and cares for her around her, and while taking care of her, she takes care of her bath... and then Saya-nee bursts in naked. He even takes care of his lower body. In fact, he wasn't doing well with his husband, so he came to relieve his frustration. My sister's true goal was my dick...