Chodric

What did actually happen with Cho and Cedric between the yule ball and the final tri-wizard-champion task?

"She swung the cape thightly around her and entered the biting air with her scarf around the bottom of her face. The grass chrunched under her shoes while the red sun threw shadows behind every tree.
But then something or someone came from behind and Cho sensed a cold but still warm breath on her neck."

A fanfiction about the secret of Chodric that never got menchioned.