She's obviously coming whether you want her to or not. Why not just ask her to limit her power unless absolutely necessary?
I won't say completely, because I would love to see a rapist get hit by the 'sigh' that destroyed an eighth of the moon, lol.
Wait so he isn't her real son? That makes her clinging less creepy but his escape even closer to impossible. I don't see her letting him leave without giving her some more children.
@Sakuratea If i had to guess, he probably see it as flirting or something sexual. Like how if any female characters is slightly shown being interested in MC there's always people saying harem +1 while in real world there's difference between interested in, like and love.
@Kiriha @Sakuratea. Yea, I could have put that better. Its clingy mothering now but this being manga and all, there exists the chance of her just being the first harem member.