I (a college student) took advantage of the temptation of a cute junior (who has a J* boyfriend) and had sex with all day

Yuta, a college student, has long harbored an interest in Mami, but he has always considered her off-limits due to her having a boyfriend. However, with her graduation soon approaching, Yuta decides to take a chance and invites her out. Their date takes a swift and unforeseen turn to a love motel, where Yuta soon realizes he underestimated her. As Mami not only takes the initiative but displays a wide variety of moves.