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The professor groaned loudly as he came down his TA's throat but it didn't stop his lecture. Doctor Caspern continued smoothly through his discussion of electromagnetic fields even as the young ferret smacked his lips against the old Shih Tzu's cock head. He even made an example out of him, exhibiting some form of attraction and repulsion by grasping his assistant's head and pushing it back and forth on his cock.

It was a good class. Dr Caspern managed to keep the classes attention without sacrificing his ability to impart real knowledge. It was Christian's favourite class. Admittedly he had developed a crush on the plump, older dog but even if he'd been a woman he'd have appreciated the course. So he sat listening intently, scribbling out notes to keep up with the professor's quick speech and wished he could be sucking his cock instead of the TA.

The fox always came to class naked but he couldn't handle the erection spilling precum down his balls. He just had to grind every once and a while up and down the dildo in his seat to keep his fantasy of sexing his teacher alive while he did his best to absorb the lesson. But time only went on so long and the class ended with a reminder that the lab tomorrow would require everyone to come to class dressed and everyone started to mill toward the door.

Christian stayed in place though. He had no class scheduled after and he wanted to see the doctor cum again so he packed his things and lifted himself off his dildo to lube it again. The ferret kneeling between Caspern's legs was good at his job: bobbing fast up and down his fat tool while his fingers gently fondled and stroked the heavy balls hanging beneath it. And the way he slurped and gasped he was obviously proud of his work too.

All the more reason for Christian to get jealous. Quickly enough it was just the three of them enjoying their various modes of pleasure and the heavy set dog smiled to his student waving him closer. "I hope you don't mind sharing, Mr. Kincade," he announced to his TA pulling him deftly off his length. "But it looks like Mr. Rackham wants to take advantage of office hours."

The fox perked up instantly. He stumbled around his desk pushing his bookbag clumsily with his feet before kneeling down at Dr Caspern's feet. The smell was rich and by the way his cock throbbed he was close to cumming already so he went right to work, licking up and down the dog's length while the ferret beside him sucked on his balls.

"Actually Mr Rackham I want to commend you on your report last week. You're progressing very quickly," he explained, reaching for his papers and thumbing through them while the two young males sucked loudly on his thick tool. "You're very thorough in your experimentation and your report has all of the details. Are you thinking of making a career out of this field?"

"I hadn't thought about it really," the fox managed between kisses and licks against the TA's lips around the warm trembling dog cock in their mouths. "I just think the stuff we're learning is really fascinating."

"Not to mention that boner you get for Dr Caspern," the ferret added before deepthroating the huge pole.

"Inspiration comes in a lot of ways Mr Kincade. If my penis inspires him to advance science then so be it. Now you boys figure out how you're going to take my load. I'm very close."

The TA took control in a second, pulling Christian into a kiss around the massive cock head, their tongues writhing together over the tip of it while the thick bodied canine stroked himself to a finish. The result was a mess. Cum splattering from their lips and over their faces while they struggled to drink up as much as they could. His seed was thinner than it looked but it was potent and flavourful, filling Christian's head with the taste.

He wanted more but the load ended anyway, the Shih Tzu patting both heads gently as the next class started to make their way to their seats. "Afternoon class. Go ahead and open your books to chapter 16, we're going to be discussing electromagnetic fields."

Before he finished addressing the class, the dog looked down to the pair still sticky with his jizz and smiled. "Do you have time to give Mr Kincade a little help, Mr Rackham? I've still got a few more loads I need to dump and there's only so much one ferret can do before he needs to get off himself."

The TA didn't even wait for an answer, simply ripping out the dildo from under the fox's tail and pushing his cock in it's place. He pushed in fast and hard, plowing him as deep as he could from behind while Dr Caspern started his lecture anew. The class followed along in respectful silence, save the soft wet sounds of masturbation from a few, even as the professor grabbed a bottle of lube and started to prepare his dick.

Mr Kincade stood slowly, never pausing his barrage on Christian's rump until the slick-dicked doctor grabbed his student by the hips and forced his legs up. The fox was a little unsure but he couldn't turn down an opportunity to be fucked by his teacher so he wrapped his legs around Caspern's plush body and braced himself for a thick insertion. The two cocks jostled and fought for space but they kept pushing, thrust after thrust of sloppy effort, loud slaps filling the air but not so much as to interrupt the dog's lecture until both tools slid in deep.

The fox bit his lip to keep from shouting over the lesson but after the initial penetration he loosened his grip, just panting and grunting quietly as they pounded him. His own cock ground into the soft fuzz of his professor's round belly smearing precum into it while the two continued to fuck him fast and hard.

The class watched with increased interest, the number of fapping noises increasing drastically but Dr Casper wasn't distracted in the slightest. He even dragged his two young partners to the board to scribble out his notes and examples while his meat filled Christian to the brim.

Soon enough, the climax came, though, both males grunting loud as they pumped the student full of fresh hot cream, his hole stretched open wide enough that he could feel their cum gushing out of him and splattering on the floor but when they both stopped cumming they didn't stop fucking. They just kept going at him, some of the students grunting and groaning with release at the sight while the fox squirmed skewered on their meat.

Eventually though, the class ended and Christian was pleasantly sore and getting ready to accept their second loads. One of the male students wandered over, jerking off as he asked for an extension on a report that would be due very soon. He looked like he wanted their sloppy seconds but obviously he had something more important on his mind keeping him from grabbing the fox held between the profressor and his assistant.

So they continued while he pleaded his case, balls slapping each other why they discussed his poor sick grandmother and the trouble he's had taking care of her. Christian listened grunting and whining softly until the pair came again, a thick cascade of mixed spooge falling out of him again before the dog pulled his length out and showed it to yet another student.

"Mr. Kincade, if Mr. Rackham still needs tutoring please take him back to my office. Mr Anderson here is gonna get an extension once he helps me with another orgasm."

A great teacher, really. Always willing to help his students and completely insatiable.