Sounds good to me! In reality I don't think they interact. Likely as you said, she heals him when he needs it, maybe she tags along on an uneventful mission or something. It's also possible around the age of 19-20 they may be looking to become Jounin so that would be an interesting thing to see happen.

And yeah, go for it! I'm excited for you! -laughs-

Plus we can pick what stuff becomes a major plot point, it doesn't always have to be fighting/drama like in the show. We can actually take our time to enjoy development.