Really liked this pairing, but... Gust never really did anything with it other than a optional scene in Meruru that is immediately killed by the popular girl ending (aka the ridiculously easy to get ending). In fact, Gust never did anything with anything, out of fear of pissing off their loyal otaku buywers who considered X or Y girl to be their waifu, which greatly annoyed me.
It felt that way in Lulua too. Lots and lots of flirting, but nothing really sticks.
Quite a bit of yuri in it, though. Eva crushes on Lulua hard and pretty much confesses, there's the whole bit where Lulua accidentally proposes to Refle, lots of cute scenes with Mimi and Totori...