I don't necessarily see any definitive sign that she wants to pursue it. It started off really role-play ish with her being a naughty wife with her boytoy. I don't doubt that she's thought about it, but whether she sees it as a fantasy purely for heightening her sex with you or something she actually wants to pursue... Who knows unless you ask her? Thinking something sounds exciting and actually wanting to do that thing are two very different ideas.Any ideas or insight? Also, just going by the conversation, how would you guys gauge her interest? I really look forward to the responses and insight.
I would totally just bring it up some evening when you two have some time to talk. Just say something about how exciting you found talking about it and that you think you would really enjoy seeing her with someone else, and then ask her if she would seriously like to try to have a threesome. Waiting until life calms down a bit wouldn't be a bad thing to make sure she has the energy level to actually discuss the idea, but I wouldn't' wait too long since it has come up recently anyway.