A Love That Could Kill

There is a prince of spring, one of summer, one of autumn, and one of winter. Spring belongs with Autumn, and that's so they can balance each other out. The problem is: Spring and Winter have fallen in love, and that love they have for each other isn't the way it's supposed to be. It's dangerous.
It could kill them both, but they can't stop.
It's not like they want to anyway.