Imagine just beating the shit out of Megumin's little ass. Like, she only makes a small mistake, maybe gets a little snarky, so you grab her, pull down her panties, and just start destroying her ass until she starts begging for you to stop with tears in her eyes. And then you just keep beating her with the same force, not getting exhausted at all, so she just breaks and doesn't have the energy to beg anymore. She just accepts the pain and screams knowing that she's not in control of her own body, knowing that you can and will beat her for however long you see fit. By the time you're finished with her, blood is running down her legs from her ass being blistered and having those blistered beaten open. She collapses to the floor, both physically and mentally scarred. She will never get to feel truly safe around a person ever again and she becomes completely submissive to you and pisses herself out of fear whenever you yell at her.