Seeking out a fanfic, pretty sure it was on Ao3. Sterek end game, time travel. Stiles ends up in the past (the details of how are fuzzy) and meets young Derek who hides him in his treehouse until he brings Talia to meet him. Stiles explains a few things to Talia, gets the Sheriff in the know. Future stiles fades away. The Hale family lives, sheriff
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