When Riley Reed walks in and strips naked, Damon hides in the closet and strokes his stiffie.
Later that day, Riley finds that Damon has been jerking off into her panties and putting them back in her drawer.
They keep going, with Riley falling to her side so that Damon can spoon her from behind as he brings her off again.
She yells for him to get into her room, and then orders him to cum on her pussy instead of her panties.
Only after her stepbrother has jazzed in her mouth does she realize that she has mistaken his identity.
Moments later he pulls out one last time, and covers her pussy with his jizz just as she demanded.
After seating herself on his stiffie, Riley takes turns grinding her hips and letting her stepbrother do all the work as she takes what she wants until she squirts everywhere.