Welcome to our forum.
It sounds like you're taking life as it comes, and enjoying your time with L while it lasts. I hope you'll like our site and get much benefit from our various threads. There's so much to learn about poly.
I assume you'll want to discuss poly with your kids eventually. I think the way to describe it depends on the age of the child being addressed, but "boyfriend" and "girlfriend" are probably okay terms to use, and the most important thing is to let the child know their household (and place in it) is secure. You have to be prepared to answer any questions the kids may have, of course.
Let us know of any questions or concerns you may have, as you can get quite a bit of information and feedback here.
Glad to have you aboard.
Love means never having to say, "Put down that meat cleaver!"