There are two entirely different scenarios. The phallus/cornu attached to the cross stipe is molded rubber shaped as a very large erect penis, positioned at a 45 degree angle. The head of the penis is mushroom shaped. I am first raised up and have my arms spread wide and each wrist tied to the pentablum. My legs are then lifted and spread wide apart and my anus, well lubricated, is aligned with the head of the rubber cornu. I am then slowly lowered onto the cornu until it is buried in my rectum. My legs are then bent at the knees and pulled back and secured at the ankles behind the stipe leaving me in a squatting position. I have enough latitude to pull my torso up but the design won't allow me to pull up and dislodge the head of the cornu. In order to relieve the stress on my upper arms, chest and shoulders I am forced to move up on the cornu and then slide down when I can no longer hold myself up. In the struggle to pull up and dislodge the head of the cornu and the inevitable sliding down I fuck myself over and over again and usually ejaculate at least once and sometimes twice. Exhausted, I slide down, buried to the root of the cornu and remain hanging like that until my MASTER takes me down.
The second scenario is when my MASTER fucks me and fucks me so hard and for so long that I end up cumming from that alone.