I'm blindfolded, tied to a chair, both hands behind me. In the darkness, I hear heels tapping on the floor, approaching. Speed in front of me, Mistress leave in close, and whispers in my ear "Ready, toy?" I mutter unintelligibly through a ballgag. Mistress touches my shoulder, then slowly traces a line down my chest. She trails her fingers over my hip, and thigh. Without warning, get other hand grabs my already granite dick, and strokes it a little. Although I can't see, I feel movement as she steps over me, facing me, one leg on either side of me. I can just smell a hint of her already wet cunt. Releasing my chick, she again traces her fingers slowly down my chest. After a pause, mistress lowers, impaling herself achingly swirly onto my velvet hardness. She does not stop until she is sitting on my thighs, me buried as deep as I can be. She sits there for a moment, then wriggles deliciously. She stops moving again, and waits. I start to move, but she lifts herself off me, frustrating my attempt. She steps away for a moment, and I hear wetness sloshing in latex. She returns, straddles me again, her warmth brushing my glans. Her hands move, and there's a heavy, soft weight on my head. I know it's a balloon, filled with something. I hear it Mistress slowly lowers herself onto me again, but this time, there's no pause. She rises smoothly, and starts riding me. Slowly at first, speeds a little, then settles into a steady rhythm, up and down, not hurried. I can still feel the weight of the balloon on my head, bouncing a little as she bounces, holding it. I wonder what's in it, knowing her likely plan. Soon, the pressure begins to build in me from the maddeningly deliberate friction. I'm beginning to get close, and try to warn mistress, but the gag muffles the sound. I feel it build, my muscles tensing. My back starts to arch. Mistress finally speeds a little. I raise my face, and the heavy weight of the balloon shifts forward a little, sitting right on my upraised forehead. I know I'm about to blow. And just as I do, she stands straight up, releasing me, and bursts the balloon with something sharp. Warm, heavy wetness sprays out from the balloon and my dick pulses, also splattering everywhere. The warmth on my face smells like custard, and the mass of it slides slowly down over my face, and my arched neck, dripping and spattering onto my chest, down to meet the fluid I sprayed out. As the tension leaves me, and I sag limply in my bonds, mistress says "Look at the fucking godawful mess you made, you hopeless slut." She slaps me, before stepping away. All I hear are the taps of her heels as she leaves the room, and the steady dripping of custard onto the tarp on the floor.