hunterdonNJcpl, from your posts over the years it’s clear that you and your wife enjoy a lifestyle relationship that would be the envy of many, if not most, members of this board. In retrospect, clearly your then GF (now wife) was already an adventurous soul.
But a note of caution to others who might take a similar "play it as it lays" ad hoc approach to entering the lifestyle with their partner. While you successfully guided this encounter to your desired outcome without having previously had a specific or even general discussion with your GF about bringing others into your bed, I think it is important for members of the board who have not yet taken the step of acting on their interests, to understand that in most cases this approach doesn’t end well. Either the woman shuts things down, often in a huff, or (particularly if there’s been a substantial loosening of inhibitions due to alcohol or drugs) she goes along in the moment and then in the aftermath there are serious recriminations.
(As an analogy, one might jump out of an airplane without a parachute, land in a haystack and walk away. More often the impact will just make a small dent in the ground. 😉)