"(1) historical"
Well, darn, then I can't send you over to Meisha Merlin. This is going to be difficult; the historical fiction market is a tough one, and even tougher for gay works.
(I grub around in my links for a while.)
Okay, here's something.
Historical Novels Review Online publishes reviews of e-books (among other things). That would give you some idea of where historicalfic e-books are being published.
My
Homoerotic Historical Fiction Links directory is exceedingly small, but you may something helpful there.
(Tries to think of an excuse to look at your story.) Well, honestly, I have one: I can't tell from your description whether this is gay historical fiction, historical fiction plus m/m romance, or historical m/m romance. And though it's been about twenty years since I looked through the young adult titles - and for all I know, there are NC-17 scenes in them now (they were getting pretty near to that in the eighties) - I can make a stab at whether the novel has a YA feel to it.
I'll have to leave it to others to advise you on e-publishers, though.
My e-mail address.