Harry Potter: Unleashed

At the end of third year, when Dementors threaten a past version of Harry Potter and his godfather, Harry knows it's officially time to perform his very first Patronus Charm... But that's the moment he notices a bottleneck of some kind that he can't seem to force his magic past, and he realizes it needs to be destroyed before he can do anything else... Harry Potter/Fleur Delacour