well, "happen" might be too strong of a word. they started diễn xuất awkward around each other, but it was clear to everyone that there seems to be something between them.
Oh, that's all? LOL – Liên minh huyền thoại well at least being conscious about it is quite a progress I guess. <3 Don't really know anything that has happened in Fairy Tail past the Tenrou Island Arc.