Til We Ain't Strangers Anymore
Stiles should've expected Derek to suddenly disappear since the werewolf was in the habit of taking off without notice. However, Derek always showed up when they needed him.
As the weeks pass by, Stiles is no longer confused and a little hurt. What started as heartache begins to get worse the longer Stiles goes without seeing Derek. Eventually, his body begins to shut down and his only hope seems to be Derek...but nobody can find him.
There's no cure for a broken heart. Except, maybe, the cause for the broken heart himself.
- - -
Or the one where Derek takes off without warning and Stiles finds out he could be Derek's mate and the distance between Derek and Stiles, along with Derek's refusal to develop the bond, is slowly killing Stiles. Without Derek, Stiles will die, but no one knows where he is or how to contact him. And Stiles is barely keeping it together.