彼女が出張で不在の間、彼女の妹と朝から晩までひたすらハメまくった3日間の記録 坂道みる (2019)

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Which do you like better, oneechan or watashi? Me and her, going back and forth between our rooms, promising to marry. I thought those happy days were going to last forever... Until that day... . As soon as she left for work, my sister actively seduced me, and even though I felt guilty, I ended up with my prettier sister until I ran out of sperm. The days of fuck with my sister were the worst, the worst and most exciting three days in my life.