I walked up behind her just to playfuly let my cock rub her ass in her house coat (like i have done in the past) as she was standing at her kitchen si...k. this time she turned, and her house coat was not tied and she was totaly nude. she grabbed my cock and I thought I would explode on the spot. she reched in and pulled my cock out and began stroking it and asked if I liked what I had seen a few days prior. I told her hell yes i did as if you didnt notice. she then went to one knee and started. Susan quickly got her attention back to what she'd been doing to me, and was soon taking nearly my entire length into her mouth again. But I knew that Diane was having her own fun with Susan by the way Susan would close her eyes and hesitate briefly when Diane did something particularly pleasurable.I looked at Holly again, and saw that her eyes were jumping around from what Susan was doing to me, to what Diane was doing to herself, and on to what Diane was doing to Susan. Holly didn't even seem. . But we went our separate ways that night and I put it all down to both just being drunk. Then over the next few weeks when I was over at my girlfriends house, me and her sister started talking more than we usually did, she seemed to be taking more of an interest in me and likewise so was I in her but still nothing dirty or over the top...Then I was asked to house sit for a night which I was fine with. They left during the day while I was at work so in the evening I went straight to their. She started stroking faster but then she abruptly stopped. She looked up at me and said "What are you thinking?" "Do you want to keep going?" I told her the truth, I was nervous but I know that I didn't want to stop. She smiled and said that she was glad I was honest with her. I told her lets keep going and she where it leads, we can always stop if either of us gets uncomfortable. As soon as I said it I knew I was in for a wild night. She knelt down and started stoking me again, I was very.