Kristofer Weston and Saltnginger - CBT: Waxed Polyester Thread
In the titles of the video, Kristofer Weston identifies the material used to tie his cock, balls and nipples as "piano wire" - which is reasonable because that's absolutely what it feels like. In fact, it's waxed polyester thread. And then I fucked with those bits. He did so well with that torture that I allowed him to act as human dildo for my partner and sub Saltnginger. This session was FIRE.