Despite your prior fear, you've now become accustomed to living with your mother's lusty body. After a week of non stop masturbation, you've managed a way to give your body what it wants while still living a somewhat normal life. Quite simple, really, you just have vibrators constantly on. They do the job in pleasing your lust, but not in large bursts meaning you can live life again. Your mother seems to be irritated that you found such a way. Now, not only did you have her body, but can proudly flaunt it in normalcy.
"Don't look at me like that, mom. You said you didn't care what happens to your body anymore. Or should I say my body?" You taunt her, after catching her give you a dirty look. Thankfully, with your new body's libido quenched, your normal self is able to stay in control. And you made sure with every fiber of your being to be proud of this milf body you are permanently stuck with. That is, when you can live normally: you don't want those long term pleasure sessions to happen anymore. "So, how do I look mom? I'm thinking of starting hitting up the gym." You ask her, posing her body in a lewd way while wearing just a sports bra and yoga pants. 'I will get even with that kid one of these days.' She thinks.