"Oh, sister-in-law?!" While his wife was pregnant and visiting her hometown, his wife's sister Kasumi came to check on Tatsuya, thinking he might be in trouble. Even though it had been a long time since he'd lived alone, Tatsuya was tired of his lonely life and gladly invited Kasumi into his home... "Hey, haven't you been holding it in?" Suddenly, Kasumi barged into the bathroom and pressed her big breasts against him, washing his entire body thoroughly...