I was also wondering if the Battle of Britain part would put me off, but the way it was written by the author, had me hooked, turning the pages to see what happened. The attention to the detail also had me picturing each scene quite clearly in my head.
As the story unfolded in the beginning, it was obvious that David really liked Rick, but it wasn't until after their plane crashed, that David began to get to know the real Rick, and his feelings deepened. As Rick became sicker, David would do whatever he could to help him.
The two men grew closer while stranded, and I honestly thought then that they would make a go of it, but that so wasn't the case. I do think that David was rather naive with what he thought would happen, but I did feel so bad for him, when he seemed to be rejected by Rick.
Was David reacting to the vivid dreams he had? Was that why he was rejected by Rick? Do they ever reconcile and try again?