I was not sure if she was cold or aroused.I made a show of turning away shyly while I washed my penis and balls, then I turned back to rinse. That gav... the professor a good look at my soapy cock, which had stiffened a little from the stimulation of washing. I pulled the on chain and quickly rinsed, making sure to rub myself clean of soap in full view of Julia. She smiled and shook her head. As I shut off the water, she got up and walked up to me with a towel.“You clean up well,” she said as I. With his cock still inside me, he stood up halfway and asked me if I was ready. I told him I was and to give it to me. He told me he couldn’t hear me and wanted me to beg him to fuck me. I screamed as loud as I could, “FUCK ME WITH THAT BIG BLACK COCK!”He hammered my pussy for at least half hour nonstop. With his cock still inside me, he picked me up. I wrapped my arms around his neck and his arms under my thighs. He gently tossed me up and down and my pussy had no choice but to slam down onto. Thankfully a woman came out of the stall and I quickly ran for it. I shut the door, not even caring if I locked it all the way. I hung my purse up on the hook on the door. I’d rather pee my pants than have germs and icky things on my purse. I couldn’t get my pants unbuttoned or unzipped fast enough. I was making faces as I pulled my pants down and sighed in relief when I actually got them down far enough to actually relieve myself over the toilet. I heard someone trying hard not to laugh in. It was made from some fancy kind of fabric that only girls would care about. Since she was my sister, it was hard to imagine any boy would be interested in her but I wondered if Miki planned on getting laid. I wondered if the primary purpose of this party was to get most everyone started off with a "bang". I didn't like the idea of some boy banging my sister. She may be three years older than me but I still felt protective.I was dressed in jeans that had a partial hole in the right knee and in.