You're clearly sinpired by Lorddwar's work but this is also clearly your own work with a different AU PoD (Point of Departure) and a distinctly different progression from there. As of chapter 7, you've not yet told us how/why Harry, Tonks, and Fleur came to depart after the third task but before the end of Harry's fourth year (ghod, that must have galled Dumbles) and that's an element of the backstory I'll most definitely be waiting for.
I also have to agree with busted that I've not seen many, if any, stories with the Harry-Tonks-Fleur trio solely and as a fully intimate trio. I like it and the balance of personalities between the three of them makes for a very powerful team.