threaten to punish her

"You're going to have to learn to do better then that."

She stops for a second to catch her breath.

"I'm sorry."

"Well, at least you've got the right attitude, but I think you need some more motivation."

You pull out your phone and set a timer.

"If you don't make me cum in the next three minutes, I'm going to punish you. There are all kinds of whips in here, and your tits would look very pretty with a little red on them."

Her mouth drops open and she starts to protest, but you cut her off.

"Timer's started, better get to work."

She looks panicked as she begins to frantically work at getting you off. She brings her hands up, still tied together, and starts working them up and down your shaft.

You take off her blindfold.

"Look at me while you do it."

You see her eyes look up at you with a heavy combination of desire, fear, and shame. It feels like that should have sent you over the edge, but you suddenly realize you can control when you orgasm. As you consider how mean you want to be, you look at the clock.

"2 minutes. Better hurry."

She takes her hands down, and begins to try to **** your cock down her throat. She chokes and has to pull off.

"Nice thought. I bet if you do that some more you might manage to make it.

She steels herself, and tries again. She chokes several times trying to get it all the way in. You look over to the timer

"30 seconds."

Her eyes are looking up at you pleadingly. She's almost crying now.