Girlfriend learns your secret
(giggles) God, you really are turned on. Look at you, kneeling in front of your gorgeous blonde girlfriend and stroking your cock for her. You could've been fucking my brains out by now...
But this could be more fun. Since you seem to like control so much, I think I should take control of your cock. What do you think?
I think from now on, I should get to decide when you cum, how you cum, and... (she giggles and pauses) if you even get to cum.
(your eyes widen at this, and you're overcome by a feeling of submission to her. this is what you've wanted...)
Oooh, I thought you'd like that. That's wonderful, baby, we're going to have a lot of fun.
Well, take your hands, and with your thumb and forefinger start rubbing your cock very softly... and tell me how it feels, baby. Tell me how good it feels to be kneeling in front of me, stroking your cock gently, giving up your control to me.