" He handed it to her."So, what is your math trick?" she asked."Diagramming," he replied. "I can't explain it but I can show you."She scooped the last...of her ice cream and pressed her hand against her stomach. "That dinner felt good. I was so upset after math class I couldn't eat lunch. I was hungry."Ren picked up his tray and hers, emptied them into a trash barrel and escorted her outside. It was a short walk to Moore Hall. He escorted her upstairs. "That's my room -- 257. I share it with. “DP.”My little sister pulled her lips from my asshole. She stuck her head between Cassandra and me, twisting her neck to peer up at us. “What's DP?”“Double penetration,” I grinned at her. “Our dicks fucking you at the same time.”“Doesn't that sound hot?” Cassandra asked.“Both of you? In my pussy at the same time? Wow!”My eyes widened. I meant to have one of us fuck her asshole and the other her pussy. But the idea of being pressed tight against Cassandra's hot cock as we fucked my sister's near. I showed up early Saturday morning with a bag containing proper bike-clothes to prevent chaffing. We were out for over 3 hours, and she was more dead than alive when we arrived at my place."Shower?" I asked."Oh yes!" she replied. "Will the clothes fairy come again?" she asked - there had been new clothes on Friday too."Who knows?" I replied airily and went to have my own shower.Of course the 'clothes fairy' had been there. This time with a skirt and a silk shirt. She looked really really pretty. Not the first act in a hardcore gay foursome.Dinner ended pretty late and we had all had a few drinks and the four of us were getting along well. Alex and I had established a bit of a signal so he could tell me which of the guys he liked better which didn’t really require any signal by the end of dinner. We then went back to the guys room which was just a couple of blocks south.Walking in their hotel room, Alex and his English guy moved to the couch and started making out, I moved with the.