Love at St. Mungos
Disclaimer: Not only do we not own anything Harry Potter related, we will probably end up disowning this fic. Bottom line - don't sue.
One day, Dolores Umbridge was recovering at St. Mungos when she met a dashing young man called Gilderoy Lockhart. Over the years, he'd discovered a passion for all kinds of toads and frogs and because of this newfound affection for amphibians, Gilderoy thought Dolores was the most beautiful woman in the world, and fell in love with her. They lived happily ever after, enjoying many a torrid rendezvous in Gilderoy's pink padded cell.
The end.