I went to open my stepsisters door and saw Christy on her back while Lila was sucking on her pussy and using a vibrator on her. I heard my stepsister mention that she had a strap on and first, she fucked Lila while she was on her back and then she rolled her over and fucked her doggie style with it. Lila thought it was her turn and went to town on Christy's pussy. It was about that time that they noticed me and wanted me to join in. They told me to get on the bed and both of them went to work on my cock and each other. We all took turns fucking and sucking each other and I knew that I wanted to cum in my stepsisters mouth. Christy got on the floor and sucked my cock while Lila jacked me off into her mouth. I didn’t want to disappoint the girls so blew a huge load into Christy's waiting mouth. When I totally drained my balls into her, Lila got on the bed and positioned herself so that Christy could let my cum drip out of her mouth into Lila's. It was a perfect snowball finish.