Mistress is the only one who needs to have a dick in this relationship", is what I always made you say.

But it was always meant to be taken literally. Your useless beta-cock is my property, and I have been playing with the idea of claiming it as my own. By taking it from you, of course. Snip-Snip.

A beta bitch like you won't need a cock to get fucked. Turned into an eternal bottom-bitch, just like that. I promise it would only hurt a little... much.