Uncle Iroh? or Aunt Iroh? Prince Zuko? Or Princess Zuko?

[Catherine]

If Bellatrix is still eating pinkies she won't be ready to breed for a couple of years. The breeding loan female is now eating two big adult mice at a time and she is just ready to be bred. Ball Python eggs are bigger than chicken eggs so the female needs to be a good size. A smaller female would probably lay smaller eggs, but they would be too small to do well.

That gives you lots of time to prepare. Breeding snakes takes years. Even after you have the stock and the setups you still have to wait for the snakes to grow. Bellatrix will end up bigger than the boys some day. You can pick the male with the best colour or markings. Size won't matter.