You are female Stiles Crossover of TW and HTTYD.

It was a few years after the Hale fire when you met Nyx, your Night Fury. You kept her a secret from Scott and your dad. It was a secret to yourself until the new girl, Allison Argent, followed you and saw Nyx. After that, you two became very close friends, and she even got a dragon of her own. Shela, a Skrill.

You taught her everything about being a Rider and the supernatural world. But a shitshow happened when Scott got bit and it all went downhill. After searching for the Alpha and finding him, Kate Argent showed up. While negotiating with Peter to handle Kate yourself, pack bonds formed and he became less feral. You had ordered Nyx to kill Kate right when Allison ordered Shela to do the same before running.

You followed her to your guy's hideout and find her curled up in the pillow and blanket nest.