A humiliating blowjob

You walk behind the desk and stand next to the professor's head. She tilts her head back to look up at you longingly. You give your cock a couple slow strokes, then lightly slap her cheek with it.

“You aren't worthy of being fucked by my big cock. I'll let you suck me off.”

Professor Porter opens her mouth and you slide your cock into her upside down face. You reach out and massage her tits again as her tongue rolls over the top of your cock.

“That's pretty good,” you say. “Sucking me off is the best sexual experience of your life, though you're horribly embarrassed that you weren't worthy of being fucked by me.”

The woman writhes on the desk, incredibly turned on by the feel of your cock in her mouth. You push farther into her throat, until your balls tickle her nose.

“You love me, professor. You lust for me. You care for me so much you're going to mark me present whether I'm here or not. You're going to give me an A+ in everything. You're going to masturbate while fantasizing about me at least once a day for the rest of your life, because these feelings will never fade. The fantasy can vary in details like where we are and what we're wearing, but you'll always be sucking me off because you aren't worthy of my fucking. Even that humiliation is going to turn you on.”

Professor Porter reaches down for her dripping wet pussy. She slides three fingers into it as she sucks you hard.

“Don't cum yet, Professor,” you say. “You can't cum until I do. My cum will taste better than anything else in the world. You'll cum hard when it hits your mouth and you'll never forget how good it tastes. You're going to go out with any guy you can and suck them all off so you can pretend that they're me. It will never taste anywhere near as good as mine. You'll still cum when they do, though.”

With her free hand Professor Porter reaches up and strokes your balls. A charge goes through your spine and you lose it. You push forward, burying your cock in her mouth, then explode down her throat.

She reacts with her own orgasm. Her legs bang against her desk wildly. You pull out a bit and shoot a second load into her mouth. She rolls her tongue around your cock, enjoying the taste of you. When you finish your orgasm and stop moving she sucks everything off you, then licks your cock completely clean.

“Later Professor.” You zip up and walk away.

“Please,” she begs as you head for the door. “Don't leave, please!”