One year at a Halloween party I was wearing a long billowy dress, a face mask, and no panties and this black co-worker friend I knew grabbed me and made me sit on his lap. We were in a pretty big hall type room and I was busy talking to people as they walked by and then realized he was rubbing his cock against my ass and no one could see cause my dress was draped over us. as people were walking by he lifted me up a little bit and sat me down on his very large and very hard cock.