Yuki has a boyfriend, yet she comes to stay at his place every day—not just because she likes him, but for the practical reason that it's close to school and she wants to sleep in until classes end. Her charm lies in her unconsciously seductive, defenseless presence that tempts him beyond control. Though he's repeatedly rejected when trying to make a move during their private moments, his pent-up desire finally reaches its limit. Late one night, he secretly starts masturbating—only to be caught by Yuki. In a shocking turn, instead of getting angry, she gives him a blowjob and swallows his load. From that moment, the two lose all restraint and indulge in nonstop sex until morning.