User blog comment:FairyRaven/Fairy Tail Chapter 416: Tartarus Arc: Final Part, Review and Commentary/@comment-203.215.121.122-20150121234710/@comment-7418318-20150125121128

If that's the case I wonder if Zeref did this to a woman he got pregnant himself (and if so, what kind of relationship they shared. Lover, servant, slave, random woman snatched to be bear him a child or something else?), or if he did that to another person's child... and what effects it had on the mother. I can't imagine that bearing a Demon-child would leave the mother unaffected.