This is using a suction cup dildo, mounted horizontally to the front of vanity. Basically; bond my feet and legs tightly together. Spread my cheeks and back up/slide onto the dildo until its full in. My ass pressed against the vanity.
My legs are at roughly 30° angle to the front of vanity so my body naturally leans back and into/onto the dildo.
The reason my legs are bound is two fold; one it prevents me from opening /soreading my legs. Two, my anal canal and colon are a bit more compressed onto the dildo to provide a tighter fit and more sensation.
I rarely bounce on the dildo when it is mounted horizontally. Sometimes. But I generally do more of that mounted vertical. This dildo is so long, it goes well up and into my colon. So basically, inserting it and "standing there" ......just doing that is plentiful enough!
I do have a t-bar above my head that is secured tightly to the ceiling. I grab ahold of that to steady and help support myself as zi stand there. It stretches out my body and as stated, it helps me to balance there.
Pretty awesome.