do damon and bonnie get together in the books?

50/50. Damon loved Bonnie, but on the other hand he obsessed with Elena.

There's no telling. If LJ Smith was still the writer, I'd say there'd be about an 85% chance of it happening because of all the articoli I've read about Bamon from her. But with this ghost writer, I'd say the chance is slimmer, but still very likely. We can only hope.