I've been reading Lolita by Vladimir Nabokov and stumbled across this interesting article about his relationship with his gay brother: The gay Nabokov It's worth a read even if you've never heard of Nabokov or his work. Quite a sad story, really.
I actually read the Real Life of Sebastian Knight and did some research on sergei for an essay. fascinating and terribly sad story.
Did you find anything missing from the article? I wish I'd been mature enough to do an essay about a subject like that at 15...
I didn't really find much more than the article told unfortunately. If you read the autobiography there's a bit more, but not a ton.