Lol same here LuNa is my last OTP!
Yeah Mashima doesn't screw with his fanbase like Kishi does, he actually develops the pairings he plans, he doesn't try to decieve them by pointing them in one direction then another, he decides the pairing and sticks with it, If you don't like Erza/Jellal tough, it's his story and that's the pairing you are getting. I like that about Mashima.
Wait I just realised that the LuNa could mean Nami/Luffy in which case I'm going to burst your bubble, Oda said it years ago, the pairings are non existant in the manga, he's not hinted at LuNa, or ZoRo pairings since Robins Rescue mission. So if you put your faith in Oda you could find yourself dissapointed, I can understand why you'd ship LuNa, the scene where he stop Nami from stabbing her shoulder and how he climbed up a cliff to save her....were amazing.