Because I Can't Lose You (a Stydia story){complete}

Stiles, Allison, Scott, and Lydia have been the four musketeers since the third grade. Though recently Scott confessed that he likes Allison, the couple are still waiting for Stiles to confess to a clueless Lydia. Allison keeps probing her adoptive brother (Stiles) saying that Lydia didn't know he's had a crush on her...