I'm Mori Koji. I live with my son Kōkichi and his wife, Nanako. She calls it "exercise housework" or something, but right in front of me, she sways her ass provocatively while doing chores, striking seductive poses. Day after day, seeing her like this makes my mushroom grow bigger and bigger. Ahh, I can't take it anymore—I want to ram my giant mushroom deep into Nanako's peachy ass... I've reached my limit!!