My teen stepsister pressed herself against my cock in cute panties. humping me and she got what she wanted

My innocent stepsister found a new pack of adorable panties and just had to try them on for me. She pulls out pair after pair - soft cotton, tiny bows, pastel stripes, little polka dots - holding each one up with that sweet, clueless smile before slipping them over her hips. She twists and turns in front of the mirror, bending over to check the fit, completely of how hard it is to watch her like this. Ten full minutes of pure, unscripted teasing as she models every single pair, asking if they look cute, giggling at herself, driving me absolutely crazy without even trying.