The Demon king was looking at all 5 women as he told them they need to take care of his child for 6 years then they'll have ANY WISH.

Demon king: "Understood?... If any of you wishes to leave now then so be it, you'll be send back to your world."

Erozen:"..."

Erozen is hiding behind his father as he watches shyly (Btw if you're a dude just point it out, The Demon King is looking for a mother but it can be a BxB, going like "um... I'm actually a man" XD)