Love at first sight: Swan Lake

Bowser hadn't meant to get lost (crashing into a tree) while just trying to blow off some steam! It's not his fault that it was so foggy in this stupid swamp! And why were there so many overgrown empty buildings in this place? Why was the only clear space a stupid lake, and what was with these giant stupid white birds--!?!?

You've heard of the Beauty and the Beast AU, now get ready for Swan Lake AU! Starting specifically in the second act: where Bowser stumbles upon you while you change from Swan to Human.