Description: When Castiel and the Winchesters go to New York to hunt down a demon that is taunting Dean, they are prepared to run into a small group of demons in the area. What they don't expect is to find a group of teenagers who go by the name of Shadowhunters. They find that the two of them share the same enemy. Read to find out what happens when the two groups mix and hunt together. Disclaimer: I did not steal or copy this from anyone. This is a partnered write between me and @BakerstreetWhovians. I got her permission to re-upload and pick it up on my account. We are still working on it together. The characters and story of The Mortal Instruments and Supernatural go to their rightful owners.

When Castiel and the Winchesters go to New York to find the demon who has been taunting Dean, they are prepared for a small group of demons in the area, but they find that and more... Including a "certain" group of teenagers.