Searching for a work of metafiction I read about 5 years ago, probably published originally in the early 2000s. It's a bizarre fable about a young man who develops an obsession with a girl, a stranger to him, who is in a coma. I seem to think there may have been a motorcycle involved. He tells her a series of increasingly lurid and dreamlike fairy tales about him and her, where each story is nested inside the last, like the Arabian Nights.
If I recall correctly, the characters are named only with letters, and even the "base level" of reality has a strongly allegorical feel, implying that each of alternate fantasy versions of the story is as valid as the original. It seems like Kafka and/or Nabakov may have been an influence. I believe the narrator has a mundane job of some sort, like accountant, and is apprenticed to his uncle.
I didn't find it entirely successful as a book --partly because it never felt grounded in any stable reality --but it was memorable, at least in its conceit, if not by title and author.