breast expansion to huge sizes, drunk on power, eldritch being, getting more than they bargained for, her breasts go past her waist, hourglass expansion to huge sizes, I can stop any time, living object, merged with an otherworldly entity, obvious plot hook is obvious, power corrupts, literally, there's a reason it's forbidden, they get taller, they have plans, weak mage seeks power, you know where this is going
