[another Joker and Harley Quinn] It's been so long. My love for her and her love for me.....two powerful criminals working as one. Could their biggest heist work? Could they finally take down Batman? No matter what, their evil and powerful love will shock more than thousands in this fan fiction. So hold on and prepare for great battles, moments of awe, and the greatest love story ever in evil history.

as it says

⚠️Warning: This Story Contains Violence⚠️ Dr. Harleen Quinzell has just started her first day at Arkham Asylum as a psychiatrist. She meets her first two patients and then has her appointment with no other than The Joker. He twist her world around and she falls for him. Joker developed feelings for her as well.