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I lay strapped into the penalty chair, my ass lifted high and completely exposed while my wrists and ankles stayed cuffed tight in place. Mistress May returned with her friend Mistress Cruel Jewell, and the two of them talked about how they were going to stretch my ass and use me like the hole I am for them. They started with a thick fist-shaped butt plug, pressing and working it into me until my body slowly opened around the wide shape, filling me deep as they took their time getting it all the way inside. Once I was stretched open around the plug they pulled it free and took turns driving a large handheld dildo into me with hard, fast strokes that made my whole body rock in the restraints. Soon both women had their big black strap-on dildos on and began taking turns stepping up to pound into my ass, switching places whenever they wanted while I stayed bound and open, taking every deep thrust they gave me. I was there for their pleasure, nothing more than the hole they were training and enjoying together.