Thank you for letting me play with your cock even though you're older now, big bro. Mom would be so mad if I dated, so you're the only one I can play with until I'm older. At least no one would ever suspect that we're playing around, including your girlfriend. I love seeing your hard cock throb in my little hands as I stroke it for you. Then you give me a huge load that surprises me! Even though you're the only guy I've ever seen cum, I know you do it more than anyone! Thank you big bro, you're the best! *sis and bro = step siblings.