Secretly Broken *ON HOLD*

Hi! I took over this story from the user @traaassshhh because they will soon be deleting the original story. The story may change a bit because I only have the original eight chapters in a doc. Anyways, here's the description.
When Stiles' dad is killed by the most recent supernatural being to terrorize Beacon Hills, he decides to visit his dad's adopted sister (his auntie), Jocelyn Fray, and her daughter (his cousin), Clary Fray.
To get away from his pack... his problems.
But when he arrives at a burnt-down apartment and his auntie and cousin nowhere in sight, he is thrust into the opposite side of the supernatural spectrum.
Deciding to help Clary find her mother and the cup, he is faced with the task of keeping his problems and his father's death on the down low, for the sake of Clary, which is proving more and more difficult, considering he's truly broken.
Clary and the others are buying his facade of sarcasm and lies...
Except from one sexy shadowhunter...