"But now there's both your upbringing and me stopping you from masturbating..."
You look at her with a mix of lust and fear. If she would be the domina now, you know you wouldn't be able to resist her!
"Anyway, I'm so glad you're following some of my orders! I really wanted to be the domina again last night! And it's a turn on for me that you obeyed my last instruction, even though I know you were horribly turned on!"
You nod weakly, falling into a submissive frame of mind.