Angel of Lies

Wandering a dense forest alone and confused Marinette is captured and whisked away to an isolated facility known as 'Angel Peak Mental Institution.' Plagued by visions of white butterflies and blonde boys with cat ears Marinette struggles to trust her own mind as she delves deeper into insanity.

On the run after his Mother and Grandfather were brutally killed Damian didn't make it far before tall men dressed in black hauled him into a van and took him away to facility he hasn't left in over four years. After multiple futile attempts to escape Damian is growing desperate to get out and avenge his mother's death by killing anyone that crosses him.

But in a place where currency is secrets spilt over metal tables will Damian and Marinette overcome their differences and see that their best shot of escape is each other.

There is a playlist for fic on Spotify called 'Angel of Lies' username 'LML'
Also on Ao3 @Morcitylights under same title