Sounds like a good many assumptions are being made by you and your wife, unless there is far more info than you posted here. Like, if and why she is a virgin. If she would be interested at all in having sex with a married man, not to mention a friends husband. Or if she would be attracted to you if the previous issues are resolved.
Throw in the fact, you have said previous post you two have not swung, and clearly you wife has some reservations about seeing you with another woman, and there is a friendship involved. Also your communication seems to far from clear toward each other, i.e. "I think she meant"
My advice, let this one pass until you both have more experience and understanding of the lifestyle and have become better at communicating with each other. You could be playing with fire on many levels.