WTK-101: I Want to Penetrate My Sister-in-Law — Nao Kato, 35

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When I returned to my parents' house, I was greeted by my brother's wife. She's beautiful and kind even to someone like me, and I envy my brother for having married her. Although I know it's wrong, I can't help imagining my sister-in-law's lewd body, whispering to myself, 'Ah, sis... sis...' Then my brother went on a three-day business trip. My uncontrollable desire greedily took hold of my sister-in-law's body. Nao, too, knowing it was wrong, responded to my feelings... Three secret days just for the two of us.