Waka has been having an affair with her husband's brother-in-law for the past year. While her husband is away on a business trip, the two go on a trip together, and while they are making out at a hotel, she gets a call from her husband. Waka answers the phone, afraid it will raise suspicion, but her brother-in-law is playing a prank on her while she is on the phone! Waka is getting more and more aroused, and she tries desperately to hold back her voice, but...