When Shota hears that his older brother's girlfriend, Mikuni, is coming over, he gets excited—only for his brother to dump all the responsibility on him and leave for an overnight trip. Seizing the chance to be alone with Mikuni, Shota starts snuggling up to her, gently touching her big breasts and escalating his affection. At first hesitant, Mikuni gradually gives in as Shota continues caressing her. Soon, she's fully turned on, giving Shota blowjob after blowjob and titty fucking him, indulging in a mutually pleasurable encounter.