Jerking for my slutty step sister Riley

Your younger step-sister (technically your step sister) wants to ask you if you think she looks hot for her date. She is wearing a blue velvet shirt and you think her ass looks beautiful. Riley can tell you think she looks hot and she is going to be a bit of a cock tease. She asks you to pull out your dick and you can watch each other play with yourselves. Riley is a petite girl with very small titties and she is hornier than you ever suspected. As you stroke your dick, she turns around and teases you with her little ass. She asks you if you knew that she was such a slut and you don't answer her out loud, but you never knew it. Riley tells you that she wants you to "cum for your little step-sister" and your load lands right in her mouth, much to her delight.