Tanya Huff, The Enchantment Emporium. I assume the primary and secondary leading ladies are queer because we meet them the day after a threesome with each other and an insignificant male character. The romance plot is entirely heterosexual, though. And I haven't read the sequel, so I don't know about it.

On the flip side, Huff is fannish and it shows.

Speaking of Huff, the Quarters quartet. Invented world where to all appearances literally everyone is bisexual.