POV:
You walk into your stp sistrs room and see her on the floor. She moans your name. Her eyes closed. Her fingers in her panties. The other hand enveloping her titty. Her hips move up and down as her fingers ever so gently glides past her slit. You watch her. Your cock throbbing as you scan every inch of her. You shouldn’t be so turned on. Yet, it feels so good. You touch yourself as you watch. Her eyes open a little just enough to roll her eyes back. She’s about to orgasm. She continues to moan your name until it hits her. She cups her mouth. The moans and your name slipping through. You cum in your pants. You stand there breathing heavily. She lies there catching her breath. Her legs still open. You watch as her wetness and cream leak out of her. She lifts her head and sees you looking at her. Your hands still in your pants. She smiles as if she knew all along.