The Arkhamite's Kid

"Harley first saw the kid through a window on the second floor of Arkham Asylum she happened to pass while being dragged to solitary. She watched him pile out of a van, already in the standard white uniform, fighting with the orderlies and screaming curse words. Harley grinned at the sight.

Oh, this'll be a riot."

Harley Quinn finds Jason Todd in Arkham and immediately placed him under protection. Amidst the chaos of a welcoming rogues gallery and the unraveling Batfamily, the two have to find a way to stay alive and stay together.

This is also on my account on AO3 but I added it here because of the hacking.