The Devil's Mist

Has Sterek in!!!

The Devil's Mist starts as season 6, Derek is back and Malia and Kira have survived and are still part of the pack for now. Liam, Brett and Mason are side characters as I'm not sure what to write for them.
Stiles is struggling against the evil powers and thoughts lying within him, he craves the bite and is too scared to tell Scott especially with all the trouble Theo's caused.
So he turns to another Alpha, someone who has been there for over two years now. Derek.

Little do each of them know but this season is about those two finally hooking up. Yes I ship Sterek... I'm sorry but its cute.

One night whilst at Stiles's, Derek's powers are suddenly affected, casing him to hear a heartbeat downstairs, Stiles goes to investigate, well aware to the impending doom and the out of control werewolf in his bedroom.
Problem though something happens to Stiles downstairs amd the pack try to work out what happened.

Is this a new villain or is it something even worse.