if you think about it, a lactation spell in a medieval setting would be one of the most normal spells, especially for wet nurses, the amount of women that die in childbirth, really any reasonit'd be like almost a folk spell if you think about it...
"Be careful asking for strength, Flayne. The stronger you become, you may find that the enemies you defeated were the weak you were asked to defend. You may lose that chivalry you fell in love with." - Fanfic of maybe her father Karrotte idk