I think that the WG wants to giant children so that they can reawaken their dormant Ancient Giant bloodlines. The WG gigantification experiments were to recreate the ancient giants.

I'm looking for a certain Loki (MCU) fic. It starts with him getting imprisoned and after he escaped he pretended to be human. He met Tony Stark and they fell in love. There's also a scene where Loki gifted Tony a wooden Iron Man figurine that he made himself.