Mako's husband finally returns from a three-month business trip, and her desire for him instantly surges. Though she tries to let him rest after the long journey, loneliness overwhelms her. In the dark, she secretly climbs on top and slides a cock inside at once. Thrilled that it feels harder and better than usual, she becomes addicted to a power she never experiences in marital sex and eagerly savors the heavy climax. But when she pulls back the blanket, she discovers she has been riding not her husband, but her adult son. Horrified, she escapes into sleep, yet her body cannot forget their accidental sex...