She could feel his cock begin to grow through the towel against her hip. She knew it took all the control he could muster to tell her again that they ...eally had to get going. "OK", she said. "let's get you dressed." As she disengaged from him she pulled the towel from around his waist leaving him completely naked with a half hard-on. Her passion rose anew as she stared at the huge tool that had brought her so much pleasure a month ago, and that she had been fantasizing about for the past hour. We discovered that our father had kept track of out fertility from the moment he discovered that we played around.He knew it was my safe time, so he concentrated on Glen, who fended him off until my period finished.Now that daddy couldn't gain the obvious clue, Glen and I not only had to switch sleeping locations, but we had to share little intimacies that only one of us should've heard, and then in order to pretend to be the 'ignorant' twin vis-a-vis any specific tidbits of information, we had. Allison definitely had a used asshole; it even looked like it have lips. Who knows what this anal freak girl had stuck up there over her life.“Come on already” Allison saidI came to reality and I was more pissed off than ever. I stuck my cock in Allison’s gaped asshole and started fucking her as hard as I could. I reached up and grabbed her hair from behind and she let out a screech.“Cum in my ass, give it to me!” Allison commandedI don’t even think we fucked for a minute that morning before I. “Where's Allie?”“Uh...” I felt the weight of the second floor above us. I knew Allie was doing things up there. “She's... doing something.”Sara rolled her eyes. “When isn't she doing something?”“Ooh, are you talking about me,” Allie asked. She darted into the kitchen, a big smile on her face. She was shorter than all of us, her petite build making her seem almost childish. “Just wondering what mischief you were getting into,” Sara said.“Oh, this and that,” Allie said. “Ooh, sausage.” Her gaze.