Okay, this is hard to put into words. GrayLu was my first ship in Fairy Tail, (I mean two hotties who look good together like damn) but as I've grown to watch over the show, it was clear Natsu and Lucy had a much stronger relationship than really anyone in the guild. If Natsu and (who ever you ship Gray with) weren't there, I'm more than sure Graylu would happen. They have had moments, ALOT. If you pay attention to detail. Most people only look at their ships moments and not others. But Graylu is a possibility. It's not my otp or anything- but if it became canon, I wouldn't necessarily hate it either.