She’s suddenly hugged in the doorway, unable to resist the feeling of his strong hands against her skin... "If I take any more of this... I'm really going to cum hard!" Having lived together for three years, Mari and her workaholic boyfriend, Kojiro, are practically married. As the relationship begins to stale, however, Mari becomes increasingly frustrated. One day, upon catching sight of her deliveryman Muroya's muscular body, she becomes unable to hold back her pent-up desires. Just as she begins to pleasure herself, however, Muroya returns and catches her in the act! As the powerful young delivery boy passionately claims her, Mari's body is tossed about by relentless waves of pleasure. "We shouldn't be doing this... But I’m going to cum!!"