She kept this up for a while, telling me how good it felt. I couldn't help but let out a moan or two… then she pushed herself partially off me, stra...ghtening her arms, and she started fucking me like crazy, pumping my asshole very hard.Her thrusting into my ass was moving my whole body on the bed, making me even wetter. Then I realized I was going to have an orgasm…I tried to hold back, but I couldn't. I started to come, and it was the most intense, mind-shattering orgasm of my life. With each. As my sister's back was turned, I ducked intothe walk-in closet and pulled off my clothes. I put on the thong. Firstinside-out, then backwards, then right. Although there was not muchmaterial to work with, I was able to tuck things away neatly. The stripof velvety satin between my cheeks, the air, made me feel very sexy. Iran my fingers along the cloth, perhaps for too long as my sister calledout, "Everything OK?".I answered, voice cracking, "Yeah, uh-uh, just took a little longer thanI. It had only been three hours since Ada and George had stood on the train platform in Chicago and seen their nineteen-year-old son, Daniel, off to his first year at the prestigious Wharton School of Business in Philadelphia, Pennsylvania. Ada fortuitously was in Chicago attending an opening of her first one-woman art show, an opening that had gone fantastically well. George had been busting with pride the previous evening when the four of them—Vaughn and Ada and their good friend, the Detroit. I looked around to make sure no one could see, shoved the last few stacks of prints into my pocket and quickly went into the bathroom. Locking the door, I took off my dress so that I could be completely naked and I spread it out on the floor in front of the toilet. Spreading all those beautiful pictures out in front of me, I sat down on my dress and spread my legs wide. My eyes were jumping from one hot.