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Lisa opened the door for the professor's guests when the knock came. She had not been permitted to clean up or put on her panties, which still lay on the floor near the desk.
"Good afternoon, gentlemen," she said submissively. "May I take your coats?"
"Certainly," said Dr. Smith, a tall black man with a smooth shaved head and strong features. His smile was kind and genuine, but there was a hint of a devilish smirk there too. The young man with him stared at her with a look of intrigued bewilderment as he handed over a varsity jacket and watched her hang the garments in a small closet.
"This way," she said, leading them to the sofa. "Please have a seat."
"I'm sure my guests would like to see the progress we've made with your punishment so far, Lisa," said the professor, standing beside her as the newcomers got comfortable. He unbuttoned her skirt, which opened like a wrap, and lifted it off, leaving her completely naked below the navel. "Go ahead and turn around for them, young lady."
She turned slowly, knees trembling, not two feet from the men watching her. Her smooth pussy was glistening with wetness, swollen and throbbing, clit standing out prominently with arousal. On the other side she displayed an ass covered with raised red welts and hand prints. The younger one was staring at her with his mouth hanging open.
"Don't just stare, Jake," encouraged Dr. Smith. "Go ahead and touch her if you like."
"Yes, please," she said, bending over. "I am here for your enjoyment."
She felt hands, gingerly at first, then with increasing urgency, begin to explore her. The doctor's strong fingers felt along her inner thigh, lightly brushing up against her dripping labia. Jake cupped her ass cheek, and ran a hand up her hip. She let him turn her slightly and soon his fingertips were moving over her pussy, sliding between the lips and against her clit. She had to put her hands on her knees, and let out a soft moan as she rolled her hips to grind herself against their working hands.
"Let me get this a little more out of the way," said the professor, running his hands up her ribs, pushing her thin sweater up over the tops of her breasts. Her nipples were harder against his hands than she had ever felt them. She saw his cock straining under his pants and quickly reached out and unlatched them.
"Please, Professor," she begged.
"Okay, Lisa," he said, letting her pull the fabric down. "You've earned a little taste." He worked his fingers through her hair and seized a fistful of it, pulling her head back, and laid his cock on her face. It felt heavy and hot, and she could feel the slick pre-cum smearing over her closed eyelid and stinging the corner of her eye. He slapped her with it a few times, spattering her cheeks and forehead, and she opened her mouth with anticipation.
Behind her the other men were shuffling around and then she heard the click of a belt buckle, and felt a truly massive member slap wetly into the crack of her ass, and Dr. Smith's large hands gripping her hips as he slid up and down. She pushed back against him and let out a soft moan, which was quickly muffled as the professor filled her waiting mouth. He thrust deep into her throat, controlling her head with a firm grip on her hair. She could not believe how turned on she was at this treatment; she was shaking and on the verge of orgasm already. He pulled out and his cock was covered in sticky spit, with a thick strand still connecting it to someplace in the back of her throat until it stretched and broke, falling across her chin and breast.
She felt multiple pairs of hands lifting her up, holding her in the air, spreading her legs. Someone's mouth found it's way to her pussy, closing over her with a deep slurping sound, forming a seal and gently applying suction, large tongue pressing firmly into her opening and moving over her clit. After a second it was joined by another, kissing along the inside of her ass, moving in to lick her asshole. She started to orgasm, and it didn't stop; they kept their mouths on her, pushing farther inside, as she continued to quiver and spasm. If they hadn't been holding her up, she would have fallen to the floor; her muscles were useless. She was making sounds, getting louder by the second, and the professor held her chin with one hand and slid his cock back down her open throat, making her come even harder, crying out like a wild animal around the choking thrusts.
Her orgasm started to ease off as they released their mouth-holds on her, and she felt what had to be the other student's cock sliding into her pussy and fucking her eagerly. He made smacking sounds against her ass and shoved her face farther down the professor's throat-filling erection with the force of his movements.
"Take my spot, Frank," said the professor to Dr. Smith, pulling out, followed by a thick trail of saliva. She was handed off, and found herself face to face with the doctor's smooth, darkly glistening cock. His large hands held her effortlessly and she opened her mouth as wide as she could for him, nervous about his size. There was a great bead of pre-cum dripping down the head, hanging precariously, about to drop. He placed it gently on her tongue, moving it back and forth, smearing the liquid for her to taste.
"How's that, little girl?" he asked in his rumbling voice. "I can tell you like it."
She nodded, looking up at him, hungry for his cock. He pushed it in, down her throat but softer than the professor, and then back out to slap wetly against her face and forehead. She closed her lips on his balls, licking his sack, sucking hard enough to make an audible pop as he pulled out. "That's real good, darlin'," he said, putting the head of his penis back into her mouth, letting her move around it and lick the shaft. She tried to take him down her throat as far as she could, and struggled to reach his balls with her tongue while he was inside.
Behind her Jake slowed down for the professor, who was rubbing his spit-covered cock between her ass cheeks, pressing slowly against her asshole. Jake pulled part-way out, and she felt her hole begin to give in to the pressure, and then swallow the head of her professor's cock. He pulled out, and then pushed back in, farther this time, while Jake slowly fucked her pussy. They began to synchronize, Jake moving out as the professor pushed in, now with his entire length. She felt stretched and so full with both cocks in her, she was already about to orgasm again. She began to suck aggressively on the doctor's cock, moving her head up and down and stroking him with her hands as the other two picked up speed, fucking her hard and fast from behind.
Her body was humming, quivering with every muscle as she began to come again. Her holes tightened involuntarily and she began to buck and spasm against the cocks filling her, which was too much for Jake--she felt a warm burst of liquid fill her pussy, followed quickly by another warm spurt across her ass as he pulled out to finish. Hands rubbed it into her folds and crevices and she felt like she was riding an orgasmic wave that would not break, but just kept rising higher and higher, like a tsunami. She moaned around the doctor's cock and was rewarded with a thick, hot stream of semen flooding her mouth, then spilling down her face and neck, getting all over her sweater bunched up there. The cum continued, streaking across her cheek, followed by another heavy load that fell over one eye and onto her forehead.
She licked the pearly drips from his shaft, and smiled up at him as he used his cock to smear the cum on her face and push it into her mouth, while the professor continued to fuck her ass. She could finally feel the wave breaking, crashing down through her body, reaching climax and letting out a loud shriek just as he grunted and thrust all the way in, and she felt the wet explosion of his orgasm deep in her ass.
She felt herself being maneuvered onto the sofa and eased down as the men caught their breath. She lay on her back with one leg cocked half way up, and idly circled her fingers in a small pool of semen that had found its way onto her stomach, before bringing them up to softly smear her lips. The professor wiped his glasses for a moment, and then put a hand on her breast, rubbing slowly, spreading some of the cum around, before giving it a moist little smack and stepping back.
"You've done very well, young lady," he said with a smile. "I think we're well on our way to a solution for you. Why don't you come in to my office hours again next week and we'll hammer out all the details."
"I'd like that, Professor."