Skamania County by Sarie_Fairy

After a gruelling case, Mulder invites Scully to join him for a nice walk in the forest. Some downtime in nature, together. Scully discovers Mulder has another reason for being there; something all too familiar. As they go deeper into the woods, they delve deeper into some of the bigger questions of the unknown. When an incident and a snowstorm leaves one of them in a life-threatening situation, they are both forced to confront their feelings for one another.

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If you're in the mood for a wonderful hurt/comfort fic including Sasquatch hunting and some angst then this is the fic for you.

archiveofourown.org/works/29674221