The infernal devices in a mundane high school

Diferent storyline from the infernal devices. Similar to the mortal instruments.
Tessa was Born in New York and moved to london at the age of 3 with her parents and Brother Nate where she lived as a mundane, until she met Will and the gang. She discovered what she was and the shadow world, and moved to the london Institute, leaving her highschool, London High. She became best friends with the people in the studies. That means going back to London High and seeing again her best friend Mariah, putting up with the shcool popular girls, and, a boy who is secretly in love with her. A couple weeks later, Will goes to high school alongside with Tessa for a mission of killing demons. What will happen when all girls fall in love with him?
No Jessa in this Story, just Wessa. A lot of Wessa Fluff.
All characters belong to Cassandra Clare