Shun lives with her daughter and son-in-law in a two-generation household. Although they appear harmonious on the surface, she hasn't had sex with her husband in ages and releases her pent-up sexual desires through masturbation every night. One day, she catches sight of her son-in-law Takeshi's massive dick as he too is struggling with a sexless marriage and alone releasing his frustrations… Shun becomes captivated by his cock and offers to take care of him, relentlessly draining him day and night. Meanwhile, the son-in-law becomes completely entranced by the alluring charm of his mother-in-law, which his wife lacks.
