I squeezed the lovely hills of Pat's buttocks for awhile, then reached around under her to open the sweet mound of her vulva. Her hips squirmed, and she moaned behind the gag. "Fantasy," she'd said, "utter trust, anything you want, no holds barred." The kids were out with their Aunt, and we were alone for the first time in a long time. "The nastiest pleasures you can imagine." And she'd leered at me. "Who first?" "Flip you for it!" I'd won. Now I knelt naked behind her, trying to decide just where to put my stiffening penis. As I pondered, I untied her ankles from each other, and tied each one to a bedpost. That opened her up very nicely. I smeared some oil in between her buttocks, but then decided that her pussy was just too perfect to waste. I slid forward over her back, and slipped into her. The wet warmth of her engulfed me, and I pumped in and out, long strokes, my cock swelling. The flesh of her ass moved enticingly as I penetrated her. I smiled, and slid my thumb between her buttocks, pressed it into the warm oiled bud of her anus. As I groaned and pumped faster, I felt her sphincter spasming around my probing thumb, sweet bands of muscle tensing and relaxing as I fucked her. Too soon, I came, my cock exploding deliciously, my thumb far into her hot ass. With a groan, I collapsed onto her back, sticky and happy. After awhile, I untied her, took off the gag, rolled her over. She was gorgeous and sweaty. Then she slapped me. "You FUCKER!" she shouted. "THAT'S your fantasy? Maybe you'd like to ball my little sister while the MAILMAN fucks me from behind! Does THAT sound good?" I stared, open-mouthed. Her face was flushed, her big boobs swayed exquisitely as she sat up. Her hand was back for another slap; I got up quickly. "Maybe you'd like to smear me with SHIT and suck on my nipples for awhile!? How about watching me suck off my FATHER while you fuck my Mom's TITS?? You fucking PERVERT!" "But... I..." I ventured weakly. She stood facing me, her nipples brushing my chest as her body quivered in rage, her eyes boring into me. I could smell her strongly. "You have no fucking IDEA!" she yelled, and she grabbed my arms and pulled me to her and kissed me hard on the mouth, biting at my lips and licking my teeth. "No fucking idea how turned ON I am!!" And she pulled me backwards onto the bed and rolled over onto me, and impaled herself on my suddenly hard cock, and she came and came and came, with my hands on her ass and her hips thrusting wildly. We may be a little bit twisted, but we have a real good time.