Having a guy shove his hard cock into my ass while we both wear thongs is so sexy, I love feeling the cock getting aroused by rubbing sideways on the rear strap of the thong as it fucks my ass hard.........erotic bliss.
I don't think you can get the exact blue and white CK thong in that vid anymore. They have a similar one called Calvin Klein Men's Liquid Stretch Micro Thong.