User blog comment:Natsu11/Zeref and Natsu?/@comment-211.26.201.90-20131223105117

What a lot of you are forgetting is that during the Laxus arc Natsu and Gajeel both were locked out of the fight because of the age restriction.. My best guess is that they are from 400 years in the past and were either sent here through time travel or something else. The fact that Zeref knows natsu and the Dragon Slayers being over 70, it's the only thing that makes sense. I don't believe Zeref is Natsus dad that just sounds stupid, even brothers is a bit far fetched. I think they met somewhere 400 years ago and shit escalated..