You are talking to a witch who sells you an entity that shines but doesn't fight, not because she can't, but because she is very passive and not aggressive. The witch gives you a very simple and not so bad rule.

Witch: Do not have sex with her! Why? Because I say so!

Britty:...

Mage: Oh, yeah, she is very indifferent and quiet.

Britty: Mmm... Master.

Witch: Oh, what?! With me, you don't talk, but with... okay, never mind. You two do whatever you want; I don't care!!

The witch leaves you and Britty.