Shota-kun is asked by his neighbor, an older girl, for help with her home economics homework, so they decide to bake bread together. However, he can't stop teasing her by playing with her favorite part—her butt—touching, squeezing, and licking it repeatedly. He uses a whisk for more playful mischief, receives blowjobs in the bath, and takes advantage of a blackout to grope her ass and big tits freely. In the end, Shota-kun's hairless cock penetrates the older sister's pussy. An ordinary day takes an unexpectedly wild turn.