Broken Relationship

Nashi and Igneel Dragneel are the children of Natsu and Lucy, but what happens when Nashi gets into a fight, and ends up back in time with Igneel to where their parents first met, but they hate each other and it looks like they might never get together, but if they never get together, Nashi and Igneel can never be born. Igneel and Nashi have to get them together without them knowing the truth about Nashi and Igneel.
Later there well be Nalu.
I'm sorry for any spelling mistakes.