All parties involved in this story are 18 and over at the time of the story.
I want to first thank everyone for their comments and assure you I will take them into consideration as I go forward.
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While I may have started fooling around with Alex first we never really had a good relationship as brother and sister. She was always just my little sister that I tolerated because we were family. Don't get me wrong she wasn't a bad looking girl just our personalities didn't get along with each other.
Now for our baby sister Bess we always got along in fact it was rare to see one without the other when we were home. Bess is 5' 4" with long blonde hair, baby blue eyes, curves in all the right places, and 32D breast. In fact even before I had started fucking Alex and decided there wasn't anything wrong with fucking family I found I sometimes got an erection thinking about Bess. Bess always hung around with me no matter what I was doing when we were growing up which made her a bit of a tomboy but she always had my back.
So it was no surprise to find us wrestling around one afternoon in my bedroom when things took an unexpected turn in our relationship. The thing you need to understand is that even though I had been fucking Alex for awhile it had never occurred to me to try anything with Bess. Bess was my buddy my partner in crime the one I knew exactly where I stood with her and wasn't willing to risk our bond just to fuck even though I wanted to since the first time with Alex.
I reached to grab a hold of Bess so I could pick her up and body slam her when my hand slipped. Now we had been rough housing for awhile and we both were covered in layer of sweat. So that when my hand slipped it went right down her shorts into her panties and I got my first feel of her mound. I quickly dropped her on her feet pulling my hand out after getting a nice feel of Bess and then stepped back away from her.
That is when Bess gives me this shocked look and ask me "What do you think you are doing Joe? You shouldn't be touching your little sister like that or there!"
I answer her saying "It was an accident I would never do that to you on purpose Bess! I would never try to take advantage of you in any especially in a sexual nature." That is when I got the surprise of my life when Bess reached out and grabbed me without any warning.
I was startled and jumped asking her "Bess what do you think you are doing? It is just as wrong for you to touch me as it is for me to touch you."
To which she calmly responded "Just making us even Joe what is that not ok with you? Shouldn't I at least get to grab you just like you already did me?" It was only at this point did the idea of fucking Bess even enter my mind and as soon as it had it came with an incredible urge to make it happen.
So barely missing a beat I say "Weellll it isn't quite the same since my hand actually went down inside your pants and panties" trying to see how she would react. I figured depending on how she reacted I would know if it was possible to start something with her. Little did I know what exactly I was about to get myself into or what would become of us afterwards.
Bess cracks a grin and says "Like you would let me put my hand in your pants and grab your dick on purpose so I took what I could get by with." That is when I decided to see how far I could take things before she would get scared or think about it too much.
So I shut and locked my door then went back over to her and dropped my pants saying "Well it is only fair since I grabbed you and you should get to grab me with full contact." This really did surprise but I got to give her credit she recovered quickly.
It took her a few minutes of sitting there staring at my cock before she said "Are you serious or what? You can't seriously be offering to allow me to grab your cock just to make us even."
I simply said "Hey I am only trying to make us completely even but if you don't want to it is your choice it doesn't matter to me. But then again I guess if we are to go for a complete balance I should get to grab you through your pants but again only if you are interested in us being equal." This whole time she has not stopped staring at my now erect cock.
I stand there for a couple of minutes longer then say to Bess "So do we balance things or would you rather just go back to wrestling around I need an answer." The response I receive is her timidly taking a grip of my cock and stroking it while allowing me to start rubbing her pants covered mound. After us doing this for a little bit of time I say "I guess we are almost even now except you got to see me do I get to take a peek at you now."
Bess whispers barely audible "Do you really want to see your little sister's pussy? If you do then yes you can go ahead and take my shorts and panties off so you can get your peek. I just can't believe my older brother is allowing me to stroke his cock and wants to see my pussy. "
So I do and the whole time Bess is stroking my cock so as soon as I have them off I go back to rubbing her pussy. Finally Bess comes out of her shock and says "Now wait a minute you aren't supposed to be doing that again. In fact we shouldn't be doing this at all we are family which makes this wrong." She stops stroking my cock and I quit rubbing her pussy which is really wet now.
I then sit down on the bed beside her and tell her it is ok we didn't do anything wrong and that in fact I liked it but we would stop if she wanted. Bess looked and me and said that while it did feel nice and she also liked it that because she was my sister it was not something we should be doing with each other. I realized at that moment I could easily talk her into proceeding with things but if I did it the wrong way how it would affect Bess.
So I looked at her and said "Bess I Love You and you are my little sister I would never do anything to hurt you. That yes others might see what we had done as wrong and even bad but I didn't cause we were just having fun. That as long as we both agreed and enjoyed it then it was ok cause it wasn't like we were trying to start dating. We were just fooling around with one another. It is up to you though if you want we can stop and just go back to our normal afternoon or we can continue and see what happens and whether we enjoy this new game."
She takes a while to think about what I have said during which time I just sit beside her doing nothing letting her decide on her own. Finally she places her hand on my leg and says "Joe are you sure it's ok? I don't want anyone thinking I a slut or something like that and you are my brother and best friend. I did enjoy what we have already done and actually want to see about more I just don't know if it is ok if I do it with you. What do you think is it ok or do you think we should stop now?"
So I tell her first we should only stop if she doesn't want to continue and wasn't having fun. That we could take our time and if she wanted to stop at any point we would immediately cause I wouldn't harm her in any way. As for what others might think I wasn't going to tell anyone because whatever we decided to do would be between us and no one else's business.
Again she took her time and thought about what I had just told and what it meant. After a bit she started stroking my limp cock again so I began to play with her pussy. I could tell she still hadn't made her mind up so I took my time but did move things forward to the point I had removed her shirt and bra and was playing with her nipples.
It wasn't until I was massaging her breast in one hand and rubbing circles with my thumb around her clit that she moaned and I truly took over. I pushed her back on the bed legs hanging over the side spread slightly. I got on my knees in the floor and began to methodically eat her out during which time I continued to play with her breast. I was enjoying her taste as she lost all control and had an orgasm right on my face the first time I took her engorged clit between my teeth with a gentle nibble and applied pressure licking it.