Yuzuru went to Tokyo alone for a mock exam, staying with Kazuya, a graduated senior, and his girlfriend Yuko. Yuzuru had been smitten with Yuko’s gorgeous breasts since high school, and living with her now made him flustered, his dick uncontrollably hard. Yuko fueled it, wearing revealing clothes that flaunted her big tits, parading in just a towel, making him hang her underwear, and even letting him glimpse her and Kazuya fucking that night. Still, Yuzuru fought his urges, refusing to err. But the next night, with Kazuya late from client drinks, a drunk Yuko had Yuzuru help her to bed. As he tried to leave, she teased, 'Want to see my breasts? I’ll show you. You keep staring.' Her seduction broke him. They fucked whenever Kazuya was out, giving Yuzuru an unforgettable summer.