Stiles Stilinski lost his family at a young age to a supernatural creature. He vowed vengeance on the thing that killed his family and has dedicated his life to hunting down and killing all things supernatural.
Derek Hale is a 3rd generation born werewolf, fully in control and functioning with absolutely no desire to hurt or turn other humans. When his family is trapped in their own home and burned alive, Derek hits the road to try and find something worth living for.
When a chance encounter brings the two together, they are both wary of each other, for obvious reasons. But, they decided to work a few cases together, just to see how it goes. Surprisingly, they work very well together and they spend several years traveling the country and eliminating supernatural threats, all the while, forming a close bond that neither one of them could have anticipated.
Not everything is smooth sailing though. Derek is headstrong and likes to rush into things whereas Stiles likes to research all the possibilities before coming up with a plan of attack. When Derek decides to take on an Alpha werewolf, fully powered by a pack, he’s grievously injured and barely makes it back to Stiles before passing out. Fearing the worst, Stiles says things to Derek, things he never would have been able to say had the werewolf been conscious. But, Derek hears him through his pain addled head and has enough presence of mind to return Stiles’ feelings.
My headcanon for the MCU-verse is the Frigga always wanted more children, but they only ever had Thor. Frigga smiled and pretended all was well, but there was always a secret longing for a child who was more like her. As much as she loved Thor, he was very much his father’s son and the golden child. He had no patience for magic and tricks.
And then her husband comes back from war with this infant, a child who could be a hostage against the Jotun, who could one day be useful, an ally on the throne of Jotunheim. But Frigga doesn’t see that. She sees a frightened baby, and takes him from Odin, and cradles him as if he’s her own, and the baby’s cries soften.
"He is a Jotun. You cannot forget that," Odin said, over and over, but Frigga only smiled and said, "No. He is my son."