Re-thinking. *Trigger warning*

So lately I've been thinking about how to approach a new relationship status.

Since only two couples with my partner system.
Charlie (mine) Dell (his)
Barry (mine) Josh (his)

I was thinking this type of relationship is well not working well.
And been thinking of introducing a new system.

Any alter as long as it's consented any alter to well..
Be intimate or start dating.

But I have no clue how to put across this idea.

Could it be to messy?
What if it causes fights?
Is this pushing both systems to far?

Last time I tried this to many traumatised littles appeared.
But I want to somehow make new connections with them.