Scratch Your Back, Rub My **** 4K

I am lounging on the couch early in the morning when my stepsis comes sneaking in the front door after spending the ENTIRE night out!  I ask her where she's been, what she's been doing, and with whom...  My stepsis doesn't want to tell me, so I want to tell on her to our stepparents, but she begs me not to.  She'll do ANYTHING to keep from getting in trouble with our stepparents, and I come up with a solution - I'll scratch her back, if she'll rub MY ****.  My stepsis agrees, since she knows she's between a rock and a hard place, and she lies down with her feet in the air to stroke my already-hard ****.  She notices me looking at her feet, and switches over from stroking with her hands to stroking with her feet.  My stepsis is HOT with her feet on my ****, and she even turns around so I can look at her *** while she gets me closer to *******.  She lies on her back with her feet up so she can jerk me with her feet until I *** all over her big **** and face.  I GUESS I won't need to tell our stepparents that my stepsis was out all night...