I love that closing note, it seems like these changelings create some kind of bond with their lay. It might be an explanation why they can't just dump the eggs on their own, like they need a partner, the connection with them. It is not a simple lust nor admiration,; it's a combination, including the fore-mentioned bond.

Maybe ponies are made out of marshmallow. Magical marshmallow that can fly and fit 170 changeling eggs.

I think it's a case of they need both heat and importantly love to grow new changlings Aurora was a perfect candidate because he and Kai are such a beautiful couple.

(Dumb joke time)
It's a shame that Kai only gave Aurora 36 eggs, last year he got 37..

Thank you. This was a lovely read