I don't personally understand the millennial need to LABEL all human sexual and amorous behaviour, make up a new language around it, "identify" with it and then discuss it ad nauseam, disclosing it all over the place.
I am certainly "sexually fluid", really bisexual, but I'm a mid-30 something woman with a husband and three boys who has no current interest in another sexual or amorous relationship so quite frankly bleating on about it outside of my personal relationship is highly irrelevant to everyone but me. It would be like making it HIGHLY RELEVANT that I must tell everyone I was once asthmatic, or am type O blood type, came from an alcoholic home and have had depression and anxiety. It's just not their business and unless relevant to a conversation, I'm not going to speak about it.
What in your current situation requires outside understanding of your current feelings towards your partner and the OSO by anyone? You do realise that you can just, you know, get on and have the relationships you're having as you're having them, introducing your partner as any parent introduces any partner and introducing OSO in whatever way best describes your current relationship?
So when my gay and lesbian friends stay at my house, I don't make a song and dance about it with my kids. They come as a couple, they act as a couple, they are spoken to as a couple, they go to bed as a couple. There's no TALK about it. The acceptance is in the acceptance, in the being rather than the labelling.
As for fluid-bonded, I mean, WHY? Why is this even a thing? Who on earth need's to know that about anyone EVER outside of the relationship(s) you are in?