Well done, Steve! I have been thinking (and posting) for some time now that you are luckily married to the perfect cuckoldress, and that you should share with her your deepest, darkest cuck fantasies and desires.
My ONLY caution is this -- cuckolding (IMHO) is a psychological game played between committed married people, and this game is played at a very high level, cerebrally and emotionally speaking. And I emphasize the game aspect, because cuckolding involves inherently contradictory roles and behaviors that cannot possibly co-exist in reality at the same time, or at least for very long. It's a TREMENDOUSLY exciting mind fuck to imagine -- and experience -- your wife making her relationship with another man her "primary" one and "demoting" you to a secondary position, but if that becomes the true, actual, and enduring reality, then the cuckolding eventually (and I believe necessarily) ceases to be about you, and your relationship will continue only as long as it is convenient or otherwise useful for the wife.
Think of it this way. I know this forum isn't about BDSM, but imagine a masochist who gets off on the fantasy of torture or physical pain. It's very exciting for him to experience strong physical sensations as sexually-motivated infliction of pain, but only to the extent that at a deep level he trusts that his dominatrix is just playing with his fantasy and not really going to maim or destroy him. It helps his fantasy if he can suspend that belief in a play context, and the more "real" it seems the better it is for him. But it's not "real." I doubt there are very many BDSM bottoms who really want their fingers smashed with a hammer, for example.
So it is with cuckolding. Steve, what you have observed about yourself many times, is that your pleasure is dependent on Sue wanting her to do cuckolding things for herself, that she really wants and likes it. I get it, it's all good. But please be careful with that notion that in order for it to be good for you it has to be what Sue actually wants, when it comes to making you her beta male. I have a feeling that you don't REALLY want to be her beta, rather, you want her to help make you FEEL like you're her beta -- some times and in some ways. At bottom, it's got to be an act, a pretend. The contradiction is that the more real it seems, the more fun it is. But you don't really want your thumbs smashed.
Any way, at the stage you both now are, you are in for some truly tremendous cuckolding fun. Get ready for the great mind fucks to come! And thanks so much for keeping us all in the loop.