Sarah was failing hard. Her lit professor, Dr. Harlan, had made it clear she needed at least a B on the final paper or she was screwed. At twenty, she was not about to repeat the semester. She waited until after his last office hours, when the building was quiet, and knocked on his door.
He looked up from his desk, wedding ring glinting under the lamp. Mid-forties, salt-and-pepper hair, tired but still fit. “Sarah. What can I do for you?”
She shut the door and locked it. “I need that B. I’ll do whatever it takes.”
Harlan leaned back. “Whatever?”
She walked straight to him, dropped to her knees between his spread thighs, and put her hand on his crotch. “Whatever. You’re married. I don’t care. I just need the grade.”
His cock twitched under her palm. “You’re serious.”
“Dead serious.” She unzipped him, pulled out his already thickening dick, and wrapped her lips around the head. No teasing. She sucked hard, taking him deep in one go, gagging when he hit the back of her throat but not stopping. Spit ran down his shaft as she bobbed fast, making wet, filthy noises.
Harlan groaned and grabbed her hair. “Fuck. You’re good at this.”
She pulled off long enough to say, “I’ll let you fuck me raw if you change the grade tonight.” Then she went back down, tongue working the underside while her hand pumped the base.
He stood, pulled her up, and bent her over his desk. Papers scattered. He yanked her jeans and panties down to her knees, spread her ass, and dragged two fingers through her already wet slit. “You’re soaked. You really want this trade.”
“Stop talking and fuck me,” she said.
He lined up and shoved his cock straight into her pussy in one thrust. Sarah gasped, gripping the edge of the desk. He was thick and she felt every inch stretching her. Harlan started pounding immediately, no warmup, balls slapping against her clit with every stroke. The desk creaked. Her tits pressed against scattered exams.
“Harder,” she grunted. “Use me. Fill me up.”
He did. One hand on her hip, the other yanking her hair back so he could watch her face while he railed her. Wet sounds filled the office. Her juices coated his shaft and ran down her thighs. He reached under and rubbed her clit in rough circles until she came, pussy clenching hard around him, a low moan escaping her throat.
Harlan didn’t stop. He flipped her onto her back on the desk, hooked her legs over his shoulders, and drove back in. The new angle let him bottom out. Sarah’s tits bounced with every thrust. She reached down and spread her pussy lips wider for him, showing him exactly where his married cock was disappearing.
“Tell your wife you’re grading papers late,” she panted. “Come back tomorrow and do it again if you want.”
That pushed him over. He slammed deep, held there, and unloaded. Thick ropes of cum pumped into her, hot and heavy.
He kept thrusting through it, pushing his load deeper until it leaked out around his shaft.
When he finally pulled out, cum dripped from her stretched hole onto the floor. Harlan tucked himself away, breathing hard. “B-minus if you suck me off again right now. A if you let me fuck your ass next week.”
Sarah slid off the desk, turned around, and bent over again, reaching back to spread her cheeks. “Make it an A and you can have my ass whenever your wife’s not looking.”
He was already hard again.
