User blog comment:Stone Roger/Natsu and Zeref have somekind of relation?/@comment-121.54.44.164-20140405100109

maybe zeref witnessed Natsu of what was just happened when he was a baby, Maybe his the one who give Natsu to Igneel... and since Zeref is an Evil one, there's a possibility that Zeref is the one who killed the real parents of Natsu thats why he felt sorry and waiting for Natsu that someday Natsu will end his life.