Sayuri lives with her daughter and son-in-law in a two-generation household. As a full-time housewife, she occasionally models swimsuits on the recommendation of acquaintances. One day, she finds her son-in-law Kouno masturbating with her swimsuit... Apparently, he has an oversized penis and his marital life isn't going well because of it. However, Sayuri is captivated by his massive member and tells herself it's 'for her daughter's sake,' relentlessly seducing him day and night. Unable to resist her lewd antics after days of denial, Kouno finally...
