She opened the doors to the study and moved across the room to the observation monitors that had just been installed earlier that day. Lindsay had be...n planning this for quite some time, and the final touches had been completed earlier in the day. She had called a security firm and had them install hidden cameras and speakers in the mini-dungeon she and Cade had created on the second floor of their home. She also had a spy cam installed near the entrance of the house so she could observe Cade. It didn't take long for us to meet up after we initially messaged each other. We had many things in common so friendship just became natural. There was about a 8 year difference in age but it really didn't matter to us. Sexually we clicked better than I ever could have imagined. She was in desperate need of a man with a big, thick cock and was craving a cock just like mine in her ass badly. In her words, "I'm an anal queen. My asshole needs pounded and I know you can help me." I invited her. My cock jumps, creating a bulge in my swimsuit, when I get my first look at her teen sized mounds. I stare at them, enraptured by her inch and a half areolas and little pink nipples. But the real treat is watching her unzip her shorts and slide them down her tan legs.My sister is average height, with a flat stomach, and a body that curves in all the right places. She turns from the window while taking her shorts off and I'm looking at her panty-clad ass, as she bends over. I start rubbing my. I even alternated taking the girls while they lay back across Megan's bed, fingering one while screwing the other. Megan and Cassidy spent the entire time looking at each other and giggling at how wild they were behaving.The following Monday was wonderful as well. Now that we were "together", Cassidy was perfectly happy for us to all have sex in HER bed instead of using the guest room. The girls took turns and generally got excited for each other, and I started to have high hopes for this.