A Walk in the Woods

Scott and Stiles have always been best friends. Since they've been best friends for so long, Scott's one year younger sister, Lydia, hung out with them all the time. Stiles technically was one of Lydia's best friends too, little did she know that one year earlier Stiles had fallen completely in love with her. Scott and Lydia had always been really close siblings when suddenly Scott seemed to be growing farther and farther away from her. She could hear Scott and Stiles whispering in the other room and she noticed that sometimes Scott doesn't even come home at night. She knows they're keeping something from her, but how far will she go to find out what.