Sorry, I know this is an old thread. I'm new to the site and wanted to post my thoughts in case Aur and Nathan still read. I have kind of a unique perspective, because I've actually done a lot of research into cuckolding (For various reasons that I'm sure I will post here later.) but I've been on "both" ends of the issue, lets say.
First off, Cuckolding is associated with the more extreme version of the kink, in the same way BDSM is associated with whips, chains and dungeons--even though anyone who is actually into BDSM knows it can has a massive, massive range. But it's always the most extreme end of the kink that gets publicized, because, lets face it, Vanilla isn't news!
That being said, Cuckolding has a massive range. It's basic definition is an unfaithful wife. However, in terms of a kink, MOST would classify it as a wife who sleeps with other men, because they can satisfy her better than the husband. It does not have to include direct humiliation, or even a husband that is unable to satisfy his wife. (Many cuckold wives are married to great lovers, as it sounds like Aur is.)
It also *does not* mean the wife has to be dominant with the husband, or humiliate him directly. Often times, in fact, the teasing is done simply by emphasizing how good the lover is, without really mentioning the short comings of the husband at all. And the husband's enjoyment is derived from watching his wife be provided for in a way he can't. (But many husbands remain perfectly confident because they know their love making fills another niche.)
It's actually very rare, in my experience (Which is limited, mind you--but I've talked with many), for the "lover" to ever eclipse the husband as a lover completely. Usually it's purely a physical thing, and the husband, rather than being humiliated or objecting to it, finds fulfillment in his wife getting what she needs--in many "swinging" life styles, it's like getting her a giant toy.
Of course it's very different in a poly-cuckolding case like this one, where feelings and love are involved (Which is actually why I'm here, but I'll make my own thread.)....but the principles are the same. The "C" word doesn't have to mean the man is a sissy, or anything of the like. All cuckolding implies is there is a sexual niche, (Which can be broad, like penetration from a bigger cock, or more physical lover) that the primary lover doesn't perform *as well* as "the bull". But that's it, sometimes there is no humiliation involved at all (I know that's difficult to understand, but try explaining how there is no jealousy to a monog person.)--it's simply a fact that the lover is better, and the husband gets off knowing his wife is being taken care of in this way.
Anyway, just wanted to add my .02$ I was very happy to see the growth of your relationship Aur and Nathan, it's a great kink to discover and I hope you two find the level of play you both like. Don't let the semantics get you bogged down, the "C" word is what you make of it.