Over the next few days, I just could not get that last session of sex with Gary off my mind. I never dreamed that people would fuck other people's asses, or that it would feel so damned good to be fucked up the ass. That fantastic feeling coupled with the fact that Gary and I cared so much for each other now, made it even more fantastic! I was going to have to see if he was doing that with any other girls. So I decided that I should find out about any girl friends he might have. He went out a lot, but he never brought one home or talked about one at home. Then I hit upon an idea that just might get me more that I had originally thought. I would tell Gary that I understood that he would want a girlfriend and all that and that I did not want to be possessive or anything. So if he wanted to bring a girl to out house to have sex with her, I would sure help him by making it a safe place to be.
Well, a couple of nights later, I went down to his room with a homework problem and he worked it out for me and then said he was going out for a little while. (This was my chance!) I said "Gary, you know that I care a lot about you and we have had some fantastic times together, but I know you must have a girlfriend out there somewhere, Right?"
He said "Well, yeah and what's your point sis?"
I continued, "I am not at all possessive of you and I want you to know that I am not jealous. So if you want to do something with your girl friend, I mean have some fun with her, you can bring her here and I promise I will not disturb you. You won't even know I'm in the house, OK? It will be just between us. I swear!"
He came over and hugged me and said "You are just fantastic as a sister, you know that? I'm horny as hell, and I want to do Maryanne tonight. She's been hinting at me to do her, so I'll see you in a little while, OK? Love ya sis!"
I went back upstairs and was almost finished with my homework when I heard Gary come back in. He came up to my room and brought his friend with him and introduced her to me and said to her "This is my little Sis, but she is really cool. You'll like her when you get to know her." We exchanged nice words and then they went down to Gary's room. She was very pretty and had big tits and a nicely rounded ass. I'll bet she is a doll when she is naked. Maybe I'll look later. I waited about a half hour and sneaked down the stairs to see if Gary's door was open. It wasn't. I was disappointed! I wanted to se him fucking someone else. So I went back upstairs and shortly I heard them in the living room and went out to join them.
I went to the kitchen and got me a glass of lemonade and went in and sat down across from them and we chatted for a while. Then it was getting close to time for Mom and Dad to come home, so they left. I went downstairs to see if she had left any wet spots in his bed. The bed was made up! Damn. So I went back up to the living room and waited for Mom and Dad and watched the end of some sci-fi movie. After they came in, I went to bed. I took a washcloth with me just in case I got to feeling horny tonight!
Just as I was about to go to sleep, I heard Mom moaning and I listened to see if it was pain or joy, but I couldn't tell. So I sneaked down the hall and their bedroom door was cracked just a little and there was only a night light on in the room. But I could see Mom really well, and she was sitting on top of Dad's cock and she was wearing him out!!! From the length of the strokes she was taking up and down on him, he has a good long cock too! I watched till she had an orgasm and then I started to go to bed but I heard Dad ask her if she still needed some more good fucking and she told him that yes she did! So I stayed to watch. She got on her hands and knees and Dad got up behind her and I could see the outline of his cock and it was a very long and big one. As he shoved that thing in her pussy from behind, my Mom groaned "Oh fuck yeah honey fuck me till I can't walk, I need it baby!"
