User blog comment:Stone Roger/Natsu and Zeref have somekind of relation?/@comment-180.191.65.238-20141223100550

In the article about E.N.D. it is said that 400 years ago E.N.D. fought Igneel but the dragon failed to kill E.N.D. so maybe instead of killing the demon Igneel decide to seal it using his scarf and the sealed demon is Nastu who became Igneel's foster son