Stiles is cursed by a witch and loses his voice. He ends up spending lots of time with Derek, and they grow closer.
I thought the witch part was a bit too similar to Anya from Buffy the Vampire Slayer, the vengeance demon who lost all her powers when her pendant was destroyed, undoing all her wishes. I'm also a bit tired of stories where Stiles seems to go weeks at a time without seeing his dad at all, which just doesn't seem right. The Sheriff is always popping up in the show!
But other than those two little things, I really enjoyed this little story.