You are female Stiles.
Everything went to shit so quickly. You ran to the Nemeton and pleaded for its aid. It aided in sending you back the day after Scott was bit. You quickly set up plans and made yourself feel as safe as possible in your room. You avoid Scott and Allison as much as possible, trauma building from their future selves actions and losing the entire pack.
One night after Scott's self-righteous act, you ran back to the Nemeton. Everything becoming too much. You sat on the stump and whimpered to yourself, trying to force the memories away. You are too focused in your head that you don't register someone approaching and kneeling down in front of you. You are brought back to reality when your wrist is captured in someone's hand and brought close to a mouth.
Peter: Well, well. I was hoping to catch you at that Halloween party, but this is a much better location, sweetheart.