The house is rocking Part 2 SeXStoRY

Lana and I didn't get a chance to be with each other for various reasons for over a week after the first night. I was in my room one morning reading over some material for class when Lana came into my room. She had obviously just gotten up and was all messed up, but she looked sexy as anything. Her nipples were hard against her tank top and the sides of her tits were viewable from the side. She was wearing a pair of tight gym shorts. "I am just waiting for the shower. I thought maybe we could get me more dirty." "That sounds like a great idea." I said, my dick already getting stiff. Lana came over to my bed and crawled up to me. We kissed and I removed her top. I played with her lovely tits and nipples for a while, and she removed my shorts and toyed with my cock. I pulled her shorts off and discovered no panties underneath. Her pussy was already very wet. I inserted a couple of fingers and started working on her pussy. "I want to fuck." she said. "I could tell." was my reply. I turned her around and put her on all fours. I worked the head of my cock up and down against her wet pussy lips to get it lubed up. When I entered her I looked up and saw Traci in the doorway. She quickly ducked out of view. Traci was a cute, short, slightly chubby red head. She had a build a lot like a gymnast, except she had big tits. There was something about her I found very sexy, but I could not put my finger on it. I found the idea of being watched with Lana very exciting, especially because the viewer was a female. I kept an eye on the doorway but I didn't want to let her know that I knew she was there. I just squinted my eyes so they were almost closed and went for it. Lana had her ass in the air and she was using a hand on her own clit and working herself up to a feverish pitch. She was backing into my thrusts and making almost a****l like grunts, saying "fuck me hard" just to keep me at it. I was getting very excited and close to cumming so I wrapped my arms around her and pulled her backwards. I was now laying on my back and she was in reverse cowgirl. I could see Traci standing fully in the doorway now. She had a towel wrapped around her and she had a hand underneath working at her pussy. The idea that she was standing there doing that drove me crazy. I have no idea if Lana saw her or not, but I think it would be hard not to. Lana was up on her haunches and I was pounding her from the bottom. She started to have a very strong orgasm which set me off. I pulled out and my cum shot all over her belly and tits. She was slick with sweat and now we both rubbed my cum all over her body. A glance showed that Traci had disappeared. "Ok" Lana said,"I am nice and dirty now." She got up and walked to the shower covered in sweat and cum totally naked. God, that was hot as fuck. When she was done she stopped by to tell me the shower was free. She came over and whispered, "Did you see Traci watching us?" "Yeah, I thought it was hot." "It was, I felt slutty, but it really excited me." "So we going to do anything, say anything?" "I will talk to her about it, I know she hasn't been with a guy in a long time. Since she broke up with her boyfriend." Lana said. "So what are you going to talk to her about?" "May be see if she wants to join us I have always been curious about having sex with a girl That got me excited all over, but Lana had class, so she told me I would have to wait. And so will you until part 3. . .