How August came to be:

(After August died, Lucy, Gray, Happy and Mavis are running to the guild)

Lucy:“Hey, did any of you see a little boy who looked a lot like the first master before disappearing?”

(Mavis’s eyes bulge out of her skull)

Mavis:“W-what?! That’s impossible!”

Gray:“Come to think of it, yeah. I saw him too.”

Happy:“Aye!”

(Mavis stops in her tracks and begins to remember something. Flash back to her first kiss with Zeref)

Zeref:(after kissing Mavis) “You know, I really want to show you how much I love you……. maybe behind that bush over there…” (points to a bush)
(Mavis looks and smiles)

Mavis:(smiling) “Oh Mr.Black Wizard! Hehehe” Zeref picks Mavis up bridal style and takes her behind the bush)

Lucy:“First master?” (Flashback ends) “is something wrong?”

Mavis:(unsure and lying) “Huh? No! Everything’s fine!”