I don't see a problem with this.
I WISH that my GF would do something like that. (Actually, we have discussed it and she has green lighted the 3-some with another woman)
Most men would give their right nut to have a GF like that.
All you have to do is convince her to let you join in. And to do that, it would appear all you need is a little red wine.
I say, invite them over for dinner one night, light a few candles, pour some wine, saute some shrimp and cook some pasta, add more red wine, once they are feeling somewhat rocked, steer the conversation towards sex, then angle it towards a truth or dare situation, then get them to kiss, and voila, you are in.
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