"I love you, big brother." When "big brother" who has a complicated love for his little sister signs up for little sister catering, little sister Natsutsuki shows up! He devours Natsutsuki's marshmallow breasts, who forgives him for anything! The two go shopping together and then have sex with little sister Natsutsuki, who is cooking in a naked apron, and cum inside her! When Natsutsuki is playing a game alone, she remembers her big brother and masturbates while smelling his clothes! At the end, he has sex with his little sister in bed and cums inside her repeatedly!