squirrelstone:

There were nights when she wouldn’t sleep. Her mind was kept awake by streams of energy and magic running through, begging her to play. And so she played, testing her abilities until they tested her back, and boy did they torture her. It wasn’t long before she ran off to Earth, still trying to control her powers and failing.

Tony found the trail of magic and ice and took Kira in until her parents could come and collect her, but protecting a half-Jotun, half-human child from herself is a lot harder than it sounds.