A downpour on a business trip leaves him sharing a room with Sayama, a quiet, withdrawn coworker he has barely spoken to. Conversation is awkward until she removes her jacket and reveals huge breasts under her soaked, transparent clothes. Unable to resist her soft, voluptuous body, he pushes her onto the bed, assuming one quick fuck will stay secret. Instead, it unleashes all the desire she has been suppressing. Thrilled that he is hard for her, she straddles him aggressively and uses unexpectedly expert titjobs and blowjobs to make him ejaculate all night long.