The Demon Within//Stiles Winchester//Teen Wolf x Supernatural//

When Stiles Stilinski was born, his mother made Sam and Dean Winchester promise that her son would live a normal life, away from hunting. The brothers honored her wish by finding Noah Stilinski, a retired hunter in Beacon Hills, who agreed to raise Stiles in peace. But normalcy didn't last. Stiles' best friend, Scott, became a werewolf, and Stiles discovered his bond with Derek Hale-he was mates with the brooding Alpha of the Hale Pack.

Still, Stiles' past isn't over. After being possessed by the Nogitsune, dark remnants of the spirit linger within him. When Sam, Dean, and Castiel arrive in Beacon Hills investigating unusual demonic activity, they discover that Stiles is the key. Lucifer plans to use him to create a dark angel under his control. Now, Stiles must fight to protect his pack, his family, and the life he's fought for, all while resisting the darkness threatening to consume him. The Winchesters, Castiel, and the Hale Pack must unite to stop Lucifer's plans before it's too late.