Locked in a room where he can't leave until he ejaculates 20 times... Having sex with his wife isn't enough, even the eccentric uncle locked up with him has to lend his wife for help. (Kawakami Nanami DVAJ-459)

When I woke up, my husband and I were locked up with a strange middle-aged man. The inmates said they wouldn't release us until we collected 70ml of semen within 24 hours; failure to do so would result in severe punishment. Having sex with my husband wasn't enough, so we had to ask the strange man for help...