Own her ass.

As you rub your cock through her pussy lips,you pull open one of the drawers of your desk. Since Zoe crashed here, you've had to watch porn in the office, so there's a bottle of KY in the drawer.
"You tease...stop fucking around and give it to me." As you pop the top on the bottle of lube with your left, you suddenly seize a handful of her lustrous dark hair with the other, pulling it taut.
"You aren't in charge here, sweetie..." you growl with animal hunger. Something...primal is taking over. You've tested the waters a little before with being a bit...forceful with Jenna. She usually responds well, but she's also usually pretty drunk or very horny when it happens. But when you tightened your grip and growled those words, you definitely heard a pleasurable whimper from this absolute MILF that you married. Time to push the envelope.
"...please..." she says.
"Please what?" You start trickling the KY between her asscheeks, and it slickens both her asshole and slit.
"Please take me..." her tone is breathy and strained with desire. You probe, ever so slowly, with the tip of your cock into her wet folds. She shudders as you start to part the entrance to her vagina. But then you pull back.
"Nnnnoooo..." she's whining like a little girl denied a piece of candy. "Give it back....!"
You push forward with your hand, pressing her face to the desktop. You have to arch your feet and stand on the balls to do it. You are firm, but not enough to cause actual pain. "What did I just fucking say?"
You can see anger and bewilderment flash across her face as it is compressed by the flat surface. For a second, you fear you've pushed too far. You brace yourself for the anger, and start preparing an apology until her eyes meet yours, and her eyelids flutter with arousal.
"...yes....sir." She still doesn't sound too sure about what's happening, but her animal needs are starting to take over. She licks her lips, and she arches up onto her tiptoes, trying to align herself with your stiff rod. "I'm...sorry sir. Please, give it back?"
"Why should I?"
"I... need it..."
"But do you deserve it?" You are riding the wave right now. The thrill of dominating Jenna is intoxicating. Your skin is flushed. "I'm not sure..."
"Yeeeesssss! Please...I'm a...I'm a good girl...." its as if she's reading from the script in your mind. It's now or never. You resume rubbing your cock head against her entrance, but you also start working your middle finger into her tight pucker with the lube. You go very slow, and at the same time you start inching your head back into that warm wet embrace of her cunt.
"Aaaah! Oh, fuck, James I don't know..." as she begins to give soft, half-hearted protests, you pull both finger and cock head back out. "No....stop taking it away...."
"I thought you were being a good girl." you pull cruelly on her hair to bring her head back so you can say these things almost right into her ear. You are careful not to pull too hard though. You're riding a razor's edge right now. If you push too hard, too fast, it could all collapse.
"Are you going to be a good girl, or am I going to have to treat you like a bad girl?"