Stretching Your Sister

I'm doing my usual pilates workout and your there.. just there starring at me... I ask if you have anything better to do but of course, you do not... go figures! I tell you if you're going to sit there and stare you can at least make yourself useful and help me stretch... You start rubbing your cock through my leggings.. I catch you being a pervert and am reluctant... hardly... because I realize how nice your cock is... I can get used to this type of stretching!!