Blood Justice by LPM-- au supernatural enforcer Stiles
Summary:Detective Stiles Stilinski is an agent of the Force, pledged to keep the balance of peace between supernaturals and humans. He loves his job, loves helping people and putting away baddies, then one day he nearly gets blown up by a pair of highly dangerous vampire brothers, and his entire world gets turned upside down. In the midst of the chaos, some legendary werewolf siblings arrive in the city to take things over and Stiles finds himself swept up in an investigation that could change lives...or end them. Will he and his new sourwolf partner, Derek Hale, find their vampiric perps and put an end to possible massacre before time runs out?
http://archiveofourown.org/series/68683 From Dirty Paws by Surreal--cute --hales alive, no Kate/Derek, full wolf change
Summary:Stiles finds a wolf in the woods. Well, it's more like the wolf finds him. Either way, he's happy to have a new friend in his otherwise boring social circle.
http://archiveofourown.org/works/1174855 Triskelion by lheadley
Summary:Stiles had an inquiring mind. Research was what he did. His research into the Triskelion tattoed onto Derek's back and engraved onto his family's trunk of werewolf restraints uncovered some startling truths the meaning of the three swirls. But for all his research Stiles could not bring the ultimate truth to light. That needed a different sort of insight, from a different sort of person. Emotionally Sterek, physically three way.
http://archiveofourown.org/works/673759/chapters/1232817