Did you know how ursula beat her male competition in the black fang and how sonya lacks male servants?
Ursula sneaks to the chambers of her male black fang competitors and seduces them to have sex with them.
Naturally no one could resist heir beauty which is why they came in seconds.
And with rule of fang leaving the weak behind Ursula used that opurtunity to executing them elimating her competition to climb her rank to be sonyas right hand.