Mha- Curing a nasty but emotionless heart

This is a love story between Todoroki and Haru you all know of todoroki's quirk it's had fire and half ice but what about Haru? Well let me tell you it's called Light Fury, she can transform with enough energy and focus and can keep that going for about 2 or 3 hours max without losing energy. If energy is over used she could pass out and faint or be in a coma for a while till she can gain enough energy back to wait up again. If she uses past 3 1/2 hours she could die from trauma or even worse falling from the sky or just mid air and hitting the ground.

What happens when she meets Todoroki can she change him for the better? Or will he remain the same? And will she be able to master her skills before she loses strength? Or will she die alone?