Rinko lives with her daughter and son-in-law as her husband has been transferred away from home. Although it's easier to take her mind off things than being alone, her body still feels lonely and she comforts herself alone every night. Then, the shadow of a huge cock is reflected on the other side of the door... When Rinko notices that her son-in-law Kunio is secretly peeking in, she boldly continues to invite him around the clock, seeking his huge dick. And Kunio, who is drowning in the eroticism that his mother-in-law exudes, is carried away and seeks her body as if he is devouring it...