A long time lurker, and first time poster here.  I appreciate all the advice that has been given in this forum that has made SA a success for me.  I do not have a .33 batting average, but it is close enough and I´m satisfied so far with my results.  Anyway, on with the question...  

So, I have an attractive SB who I have met for several months and we do seem to have a good time together.  The SB has a twin sister.  Obviously, I would love to have a threesome with her and her sister.  At the same time, I recognize that this probably the ultimate unicorn.

I have asked my SB if she and her sister have done anything sexually together as a way to approach the subject and her answer was a "no".  My SB knows that I have done threesomes in my past.

As far as I can tell, my SB has not disclosed her activities with me to her sister.   More recently, I have discovered that her twin sister also has a profile in SA.  I have not attempted to contact her (yet).

One concern I have is screwing things up with the SB while chasing the unicorn, but I´m also a firm believer in the saying "nothing ventured, nothing gained".  So, I´m unsure on how to proceed and would welcome the forum´s thoughts on the matter.

"Negative Ghost Rider, the pattern is full."  - Top Gun  

 
You have already opened the door for your SB and she chose not to go through it.  I'm guessing you don't have an exclusive arrangement with her but trying to date her twin now will look like you are "cheating" on her.   If she implied that she's not into a little fun twincest, then how will she react when she finds out you are hitting on her sister? And she will find out because they are, well, twin sisters.  I'll also guess that both sisters are aware they are each on Seeking, one probably suggested it to the other. They will no doubt share experiences and stories, while NOT sharing SD's - at least for now.  If your SB eventually changes her mind, she will let you know; ideally by showing up with her sister on a date. But if you try to press her on this or contact her twin without her first suggesting you do so, she's likely to put you in the "Asshole" box and dump you.  

 
Now that's just my POV and considering my utter failure to get any threesomes in the Sugar Bowl, it's possible I am totally wrong, or just lack sufficient game to close a twin sister deal.  Just consider the risk that if you go for it, either by contacting the twin or by pressing your SB to set it up, you risk losing BOTH.  

 
Can't wait to see what happens, though and I truly hope you find a way to sucess. Because...

 
Life is good

 
The Cat

The oracle has spoken

I, too, agree with the sage counsel of The Cat! I have had some great threesomes, an unexpected foursome and some wondrous group scenes over the years but never via the Bowl, although I've gotten close a couple of times.  I'd go with what he suggests every time!

I also agree. I’ve had several threesomes inside and outside of the bowl, including twins outside of the bowl, unfortunately not identical.  I have always let them take the initiative.  I also found the sister of an existing SB on SA.  She contacted me and, once she realized that I was seeing her sister, she decided not to see me.  I didn’t push it.

Thank you Herbcat for your thoughts...  My big head agrees with you: the risks seem to outweight the rewards and I could lose her. However, of course, the little head thinks way too differently and wants to throw caution to the wind...  An impartial third party does help put the situation in perspective.

One thought was to let my SB know that I found her sister´s profile on SA and ask for her thoughts about it, and see where that conversation led without mentioning or even suggesting the threesome on my part.  But, even that course of action does seem like stepping into a minefield.

Thank you for the good wishes...  I do hope to succeed one day with this unicorn, but for now grab a very comfortable chair because nothing will happen (at least in the short term)...  In the meantime, I will keep enjoying my time with my SB because (as someone very wise here says) "Life is good"...

Thank you for sharing your experience.

I’m a fan of threesomes. Kind of a big fan. But I learned a lesson about good to great threesomes long ago. If you believe that just having a threesome is just super awesome all by itself? Well, I would completely disagree with you. But you are entitled to your opinion. And, if you do feel that way, please feel free to disregard the rest of this reply.

 
In my opinion, everybody in the threesome has to enthusiastically want to be there if it’s going to be even as good as sex between a compatible couple. Not just “yeah, I want to be here”. But “oh yeah, let’s do this!” Anything less than that second response puts a serious damper on the whole thing (in my experience). Just having that 3rd person in the mix isn’t enough to make up for a lack of enthusiasm on the part of any one in the threesome.

 
I’ve had threesomes where one of the participants wasn’t as into it as everyone else. And, without exception, every time I walked away wishing that I’d either had someone else there or just had couple sex. I mean, in the moment it was still fun. But afterward I realized it was less fun than just about any  good couple sex session.  

 
In couple sex, when one party starts to disengage, you can focus on them and bring them back in without too much effort if you know them well enough and you are sufficiently compatible. But in a threesome it is different. When one person in a threesome starts to disengage it can be really difficult to bring them back in. There are ways. But they require teamwork of the two engaged parties in the threesome. And that’s a pretty advanced threesome skill all by itself.

 
But maybe that’s just me.  

 
Whatever you do, be safe and have fun.