Mmm, if this story was Thranduil's realisation, then you might need Legolas' pov for their meeting? You could use Gimli's pov for after that, since Legolas might need to process things? Gimli's pretty good at being the Legolas-whisperer. IDK, POV might depend on whether you want the emotional pivot to be Thranduil getting his son back, or Legolas realising he is loved.

Hah, I bet Legolas would be slightly freaked out. I mean, he's not really all that okay with having fangs anyway, let alone baby teeth on display, but I can also see it being really reassuring. (in a Daaaaaad whyyyyyyy that's embarrassing *clings* kind of way)