You're at your sister Vallery's bedroom door again, watching her through the crack undress. You've done this so many times before, jerking your cock while she takes off her bra and exposing her big natural jugs. But this time she she's caught you and she can't believe what a dirty pervert you are. At first she's mad, telling you that your sick for wanting to stroke your cock to your own sister. But then she sees the big hard bulge in your pants and decides she's going to show you more than you could have ever dreamed of. She slips off her panties and climbs on the bed, demanding that you stroke your cock for her while she makes her pussy cum. She warns you better do what she says or she's going to go tell Mom.