Just go with it

"You like my big tits?" says the Professor, slowly reaching towards her bra clasp. You nod profusely and she chuckles before tossing her bra aside and grasping your cock through your pants. "You're rather big for such a young boy aren't you? Good. More for me."

She unzips your pants and pulls out your dick, freeing it from the confines of your underwear. She rubs the length of your shaft for a bit before licking the tip. She licks from the tip down to your balls and back up before taking the entire head into her mouth. She sucks on just the head for a bit before bobbing down deeper, swirling her tongue around your cock as she does. She blows your entire cock a few times before taking it out of her mouth.

She wraps her tits around your cock and starts pumping your wet shaft. Soon enough, you're thrusting up into them and feel like you're about to explode. You spray your jizz all over her tits and go limp.

The professor licks her tits clean before redressing and heading towards the stairs. "You might want to clean up. I'll be sending your friends over in a minute," the professor says, winking.