Just as I couldn't take it any more, her hand wrapped firmly around my dick.I groaned and began cumming, which hit her square in the face. The second ...purt landed on her chest, my cock continued dribbling cum until my shaft was gooey and sticky in her hand. I stared dumbfounded as my sister began rubbing my sperm into her breasts. Then she removed her bikini bottoms and began frigging her pussy right in front of me.She finally made eye contact with me, and smiled devilishly as her hand. " Are you enjoying this?" I asked. Pulling a spray bottle of icy water out from beneath her chair and spritzing it over her ass."NO Damn it now Untie me!" she demanded with a hint of fury in her voice. But only a hint and the only contradiction to the arousal told by the rest of her flesh.SMACK! I brought my hand down across her ass."Enjoying it now?" I enquired. "Answer me with Yes Master when you respond!" I added.Again she shook her head with defiance and growled as she pulled. That kiss could have been for just a minute or for an hour, I truly couldn’t tell you but, as we broke I managed to whisper, “Take me home!” After another peck on the lips, John paid the bill and then, as any gentleman would, he walked me over to my car. He told me that he’d turn his car around and I could follow him for the few short miles to his house. I realised right then that I still resembled a Cheshire cat and the nerves I’d brought with me had been replaced by an incredible, fizzing. My younger brother Tom was turning 18 years old and I was trying to think of an appropriate gift. Between the apartment and the car, there was very little money left over for non-essentials. I asked my boyfriend if he had any ideas. He thought for a few minutes then got this real big grin on his face. "I've got the perfect idea," he said. "It's a gift I know he'd love to get and would never expect to receive."He told me his idea. To say I was shocked put it mildly. "You want me to strip in.