The Human Saddle’s Endurance Test

This slave bragged about being able to hold his breath for a long time - so Ill put this to a test. Lets see if he could serve me as a saddle for a long rail! Obviously... since hes supposed to be so suffering... he will not get long rests in inbetween! He starts to struggle after a while - but now hell have to endure it. He shouldve thought about that before bragging so much - now Ill of course push his limits even further. I sit on his face with my full weight with my legs extended over his body as well!