ROYD-171 Mary Tachibana, the sexually frustrated sister-in-law who ran away from home, spoiled me, and indulged in a sense of immorality in our small one-room apartment while having creampie sex.

My brother has a good job and a beautiful wife with big breasts. I want to marry someone like her someday! Then one day, my brother's wife suddenly came to visit! Apparently she had a fight with my brother and ran away from home... but she's staying in my room!? I suddenly started living with my brother's wife! It's too awkward, but when she complains about her sexual frustration, my reason collapses...