Spike as Celestia and Discord's son

I've only seen a few stories work with this idea. " Bud in the Oven" is one of them and another one that I can't remember it was a side story in a Heat Season clop fic and it had a equal that focus more on the Spike's parents but I want my own take on it.
I like this idea because one Celestia x Discord is a ship I really like and Celestia makes a great mom and I would just love the idea of Discord reacting to having a kid.
So the back story is that before Celestia and Luna used the elements on Discord. Celestia tried to be political and talk with Discord but Discord turn up the charm and one thing lend to another and the orange blue-jay and parasprites happen. And what happen after is history. So not long after Discord is statue Celestia starts feeling sick and a great pain in her stomach. She ask Starswirl for help and they find out that she's pregnant with Discord's child.

The issue is that the child's two blood lines are to strong for Celestia and could hurt her and the baby. So Starswirl does some magi with some dragon stuff and makes an egg to transfer the child into a dragon egg because it's the only thing strong enough to keep the powers of it's parents in check,. A side effect is that the child would have a dragon body and after it's done developing it needs a power greater than it's parents to hatch it. Celestia was planning to use the elements when the time came but Luna become Nightmare Moon before the egg was ready. So she hand to wait for the new wielders to come around and hatch him.

Also the reason why his powers weren't active til know what that Celestia put a seal on him with he hatch so she could release his powers slowly but when Tirek drained everyone the seal was destroyer too. And now his powers are all over the place. And things like the greed growth and eating that magic book did not help.