A couple where both parents married with children from previous relationships; the father has a son, and the mother has a daughter, resulting in a relationship of step-siblings. One day, the step-sister "Mio" loses her underwear. Accidentally peeking into her step-brother's room, she encounters him masturbating with the lost underwear. A struggle ensues as she tries to reclaim her underwear, but in the scuffle, it leads to a rape scenario... and at that moment, mistakenly being inserted anally...
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