Wow! You know I had a hard time imagining how Dudley/Harry would work believably, but this was brilliant. From Dudley hitting rock bottom to his discovery that Harry was the reason he was at Barton, you really showed Dudley's struggle and progress to find himself as more than a drunk and a bully. I love how after Harry finally showed up there seemed this slow build up of hinted romantic tension and how it turned into actual romance between the two.
I also really loved that Dudley had found a love of gardening and cats! :D I hope he and Harry get a cat when they finally move in together, lol. Mrs. Figg and Dean were great as well. You took two vague characters from the series and fleshed them out. Dean especially just kept growing on me more and more even to the end. You did a wonderful job with this~!