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Sasha and Austin came out of the room about twenty minutes later. A few moments later, we heard the front door open, and Austin and our mom came into the kitchen carrying bags of groceries. I stepped into the bathtub and stood behind Sasha. I felt a little weird seeing as I just spent the afternoon fucking his girlfriend, but like Sasha said, we were brother and sister. Then I would slide my cock back out until only the head was inside her mouth. I quickly glanced around again, but we were alone out here for the time being. Watching Austin pump my sister full of cum was still incredibly erotic. That is, until she reached back and pulled her bikini bottoms to the side.
