Not until I say so

For a MILF, dominatrix, or other form of sexually topping woman to say in response to when a bottom sexual partner expresses that they're about to cum.

Alternatively, a sexual joke as a response to when someone is asked to come, says they're coming (in the sfw sense), or anything along that train of thought.

Bottom: Oh god, I think I'm coming!
Mommy: Not until I say so!

~

David: Hey, do you know if Jake's coming over any time soon?
Amanda: Not until I say so!