Oi, Natsu. You should control you language sometimes:

Modification:

Natsu: This is the End Zeref!!!

Zeref: I know that you are E. N. D. But you are currently in your normal form.

Natsu: I meant that this is the end for you.

Zeref: I know you are E. N. D. for me. Of Course, I mad you.

Natsu: Shut the hell up, You Son Of a Bi-!

Zeref: We are brothers. We have the same Mother.

Natsu: Yeah forgot, you A**.

-Z