It was getting more and more difficult to hold back the pressure every second."Aren't I allowed privacy for this, Doctor?" she asked."No, I'm afraid n...t. I have to watch," he said. She wondered what was supposed to be wrong with her, but then she noted the extreme fascination on his face, and the greedy gleam in his eyes. It hit her so quickly -- the obvious answer -- that she spoke before she thought to silence herself."Urolagnia!" The doctor flushed slightly, then smiled, but he didn't take. It was a prick hardening sight to see. She was dressed in an absolutely skin-tight orange jumpsuit that was one size too small for her outlandish stack of feminine curves. Her fleshy crotch pressed hard against the severely stretched material, erotically calling attention to her world class, puffy-lipped money-maker. The pubic mound length front zipper was pulled down to the bottom of her jiggling, torpedo shaped tits, putting on display a maximum of mouth watering cleavage. The whole dazzling. Maybe she'll get going now that the vibrator is on hi... "Hmmmmmnnnnnggggggghhhhhhrrrrrrrrrraaaaaaaaaggggghhhhhh", my sister intones. Huh, I guess I was right. Imagine that.Now it's even harder to concentrate, but I remind myself that the sooner I am done the sooner we can play. Also, I need to be done before she says 'Stop!', or I'll never live it down. During the next hour she has four more orgasms (I think), and another three in the hour after that. But it is clear that she is wiped, she is. She lifted her hips and pulled down her panties, desperate for me to put my mouth directly to her. Under a sprinkling of golden pubic hair, her soft pink vulva glistened with her moisture. I caressed her hot labia with my tongue, tasting her tangy juices. I ran my tongue around her little clitoris, flicking it with the tip of my tongue. She ran her fingers through my hair as I darted my tongue into her vagina, her moaning got more and more intense until she was virtually screaming. * ‘Come on.