She was always ready and wanting sex of any kind. I wondered if she would be true if we three mated. She spent the night with us and the three of us h...d sex in more positions than I could imagine. Sira seemed to have no limits to what she did and what was done to her body. Elena found some new positions and ways to have sex.The next few days were different with Sira living with us. Elena and I had made love often but, with Sira, it was constant. I also realized that she was not limited to just. Whileworking the two fingers back and forth I started to lick the dildo andget it ready. The whole time I was trying to block out that three prettygirls and one horny boy were all watching my further humiliated myself.It was a tough task though, as there were frequent comments."Come on baby act like you like it." Faster and deeper." Just imagine what that cock is going to feel like." Does that dildo remind you of your friends from the porn store?"My time was now down to 50 minutes and I made an. “How was your first day of class?” I asked.“Just the introduction and syllabus, and a short lecture. It’s going to be a very interesting class!”“I thought being with me was a graduate level sex course!” I teased.“Oh, it is!” she said with a soft laugh. “But this is a sexuality class. So it’s more about sexual identity and the problems that occur around it. We’ve experienced a few of those in our lives.”“Tell me about it! Jennifer, Kara, Melanie, Larry, me and my sister.”“Well, for that last. She wonders around the shop a little bit, noticing all the magazines with naked girls pictured and DVDs with sluty girls on the cover. Eventually, Maddy finds herself in the area she was looking for, the toys. Maddy's jaw almost drops at the sight of the two isles full of toys of all shapes and sizes. Maddy begins to look for a few toys of her own so she won’t need to sneak into her sisters room anymore. Maddy can already feel her wetness as she picks up an eight inch dildo and similarly shaped.