This is video from "orgasmchallenge.com"
and this one is for free.
I saw this video and forgive me, but I also think you will lose
I tried something like that and believe me, if you're tied down you can't escape and if he manages to bring you to the edge and he will fuck and rub you fast and won't stop you're a loser
Btw. How long it takes you to cum using this vibrator when you are alone?