I, your step sister, am sitting beside you when I notice you have a boner. How could you be hard sitting next to me? I ask to see it, then touch it, and then I get on my knees for you. I am impressed with how hard your cock is, and suck on it. The blowjob is quite spitty and sloppy. You cum in my mouth and some drips out when I show it off, but I swallow the rest. I put your cock away because I heard our parents pull in!