My sister's classmate came to play, and she moved around in her skirt, so I could see her panties! When I stared at her, the girl noticed my gaze and hid them in a hurry, but then she looked at me with a grin on her face, and with a devilish smile said, "If you want to see it that much, I'll show you." She grabbed my head and made me bury my face in her ass! I had sex with a girl who was excited by face sitting!