Friends or Revenge?

Natsu's Letter

Natsu stood up and held up his letter to the sunlight, irked. But, nobody can argue with Erza. He started to read.

'Dear arrogant, narcissistic little bitch,
You called me weak. You called me useless. You told me that I was a replacement. That broke my heart. I am done. But you won't be missing me, will you? You say that family means so much, so what was I? When I come back, I will have yours and Lisanna's blood. You say I can't do anything withoug my keys? You're wrong, and I am going to destroy you.

Natsu smirked. Lucy couldn't do anything, especially now that she didnt have her keys. But he still had an uneasy feeling. What if she learned different magic? Or went to a different guild and got a boyfriend? For some reason, a spark of worry and resentment flared painfully inside his chest. Why did it bother him so much? He was with Lisanna. But she didn't seem like the way she used to be. She wasn't even very powerful.