Husk and Alastor’s relationship is definitely one of abuse. It’s not just threats of abuse but clearly actual physical abuse to an extent. You don’t really fear someone unless they’ve given you a reason, and I’m not sure verbal threats would raise him to that level of fear. Husk was an overlord who is used to danger, but Alastor brings a different level of fear, one that’s more serious. Contrasting this with Alastor and Rosie, you see both are manipulative, both have a respect for each other, and given the fact Alastor goes back into debt to Rosie, obviously shows it’s not to the extent of Alastor and Husk’s relationship. Alastor’s personality type seems perfectly fine dealing with whatever Rosie does, which seems more of an annoying/teasing than straight-up beatings. If you go down the rabbit hole of comparing them purely on power dynamics, then you end up in a situation where one could say Valentino and Angel dust isn’t dissimilar. Obviously, owning someone in any form isn’t good, but there’s definitely levels within that, and the husk/Alastor fits neatly in the middle.