Don't know if this helps much, but Iris Murdoch has a bunch of significant gay (mostly) and lesbian characters in many of here novels, although not protagonists.
I believe An Unofficial Rose has a fairly prominent lesbian relationship in it, although I don't think it's one of her better books - I loved A Fairly Honorable Defeat, and also A Severed Head, among others, though, but no lesbians there, that I can recall:-) Murdoch was a great writer, regardless.
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