Several years into her marriage, Rui and her husband have been trying for a baby. But their brief, ovulation-day-only sex leaves her deeply unsatisfied, and the father-in-law who lives with them sees straight through her frustration. One day, he waits in the hallway as Rui heads for the shower after sex with her husband. He pounces on her with a tireless cock her husband cannot compare to, and Rui can no longer suppress her aching desire. Her father-in-law then fills her again and again, as if forcing her husband's semen back out.