Oh, my dear GT, you must follow up on this -- and let us know all the, er, juicy details. I have to live vicariously through you younguns now that I'm an ol' married lady...
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OK, how close are you to these friends? Are you afraid that gettin' jiggy with them will lead to awkwardness and ruin the friendship? Or are you just looking to get in their collective pants and bugger the consequences? If it's the former, then you will have to approach them when they are sober (or partially sober; I'd say there's no harm in getting partway through a martini before you bring up the topic). If it's the latter, get thee to a discount liquor store...and buy the big bottle, you know, the one with the handle built in. ..
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Have fun, and don't you dare do it and not report back to us. We're counting on you for our thrills, girl...

Well she's open the door ... and it's not like she doesn't know who she's talking to?..She knows ur bi right?..When you say you recently found out that they're open to the possibility ... how so?....
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I know I know, I'm asking all kinds of questions here lol and u'r looking for answers hee hee ... but as you probably know of me by now ... that's my way of assessing how to best handle something, by asking questions ... so why not ask her a few?..
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Like ... ..
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So Susie when you say u'r a few shy from a 3some, are u serious? (with that devlish grin i'm sure you've mastered) or You know me Susie, I've done more with less, you shouldn't tease me like that?..
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I'd feel her out (lol) on her own, with the convo and see where it leads ... if she wants it to happen, all she might be waiting for is to know u'd be willing.....
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You know girls, they usually have a method to their madness ... these little comments might be hers...
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Angie..
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I'm the yin to Carlos' yang .....

Well Ms. G. by confessing this little item to you she's already admitted both her attraction to you and her willingness to play, after all would you tell these things to someone you abhor? ..
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So the ball is in your court at the moment... at the next opportunity you may want to cozy up to her a bit more perhaps arrange to put on Katy Perry's current hit (cliche I know, but it works) and lean in after a little eye to eye contact... that should get the wheels rolling...
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Much luck and as Mrs. O. pointed out keep us abreast !..
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-Carlos..
Angie's my threesome...

Yea I think you def need to make a move! It seems to me she is saying these things to open the door for you! Make comments while drinking. Also, how did you find out they do this anyways? Did she tell you sober-ly?..Bring it up again sometime...But honestly as long as you don't think it woudl make things awkward, then I say go for it!..