On an otherwise ordinary day, Professor Harry Potter was being pulled along in a Hogwarts hallway, each of his hands being held by a different woman.
One of the women was the same age as he was. She had beautiful asiatic features and her eyes were full of fire as she dragged him along. The other woman was equally beautiful, with a more typical caucasian British complexion, glasses, and rich brown hair. They were both skinny and endowed. While the younger one was about Harry’s age (one year older) the other woman was much older than both of them, already in her forties. She could have passed for 25 if she’d been a Muggle though.
“Please, you two, could you stop and explain what you need me for?” Harry asked with a little bit of exasperation.
“A hypothesis!” assistant professor Cho Chang announced happily.
“The two of us have been having a debate about if something that Cho claims to have seen is even mathematically possible,” said Professor Vector, the main Arithmancy professor. “I simply can’t accept what she’s posited!”
“You will when you’ve seen it for yourself,” Cho boasted.
“You’re about two decades too young to doubt me when it comes to numbers!” Septima said.
The two of them pulled Harry into the classroom where they taught from. Arithmancy wasn’t an elective that Harry had taken, so it wasn’t a room he spent much time in. Septima Vector had been teaching at Hogwarts for close to twenty years, while Cho had arrived as Septima’s understudy just a year ago.
When they were inside the classroom, the women locked the door behind them. Then, with the brusque motions of women without shame, they pulled Harry’s pants down.
It was a testament to the kind of life that Harry lived, particularly recently, that he only raised one eyebrow.
“And this has to do with your hypothesis how?” Harry asked.
His flaccid penis hung in front of the women’s faces. Both of them looked at it, with Septima giving Cho a look and a nod.
The beautiful Asian witch who had taken Harry’s first kiss leaned in, putting her pretty lips around him. She used the muscles in her cheek and jaw to start sucking on him hard. Combined with the feeling of her tongue running along him, Harry’s dick started twitching as it quickly got hard again.
Meanwhile, Septima started to explain:
“It happened to come up, in a casual conversation, that you supposedly have a dick that’s ten inches long. That alone, while surprising, is utterly plausible. However, Assistant Professor Chang made an additional claim, that being that she has deepthroated your entire penis.”
Cho bobbed her head to single that she stood by her claim, the whole time still keeping Harry’s dick in her mouth.
“Naturally, there were more variables to take into account, the chief one being girth,” Septima said, adjusting her glasses. “Miss Chang alleges that the width is more than five inches around. Therefore, your dick can only be adequately described as GIGANTIC.”
“S’true!” Cho said, popping her head back, leaving Harry’s half hard dick exposed to the air and covered in spit. “You’ll see!”
Septima fiddled with her glasses again, wearing a condescending expression. “I can believe his size. What I do not believe for a minute is that you can handle all of that in your slender throat. It would take an experienced, sturdier woman to achieve such a feat. You know, such as myself.”
Cho gestured angrily at Harry’s dick.
“If you’re so confident, then go ahead and prove you have what it takes!” Cho said.
“With pleasure,” Septima said smugly. “Although to reach the main event, I’ll use a more efficient method.”
The professor who had taught since the days when Harry was a fresh student at Hogwarts started disrobing. She pulled off her clothes and unclasped her bra, throwing it aside. Her breasts were C cups that had inverted nipples. Like the rest of her body, they looked younger than her true age, maintaining excellent shape.
“Now then,” Septima said.
Instead of closing her mouth around Harry’s dick, which had already grown to more than six inches even though it was still growing, Septima chose to grab him with her hands and run her tongue along him, like his dick was an ear of corn that she was licking the butter off of.
Cho huffed as she saw her superior go topless and started stripping herself. Cho had a slim thick body that still had a fair amount of muscle mass thanks to her passion for Quidditch. Her boobs were a bit bigger than Septima’s, perched above a moderately defined sixpack, while her thighs were tight and lithe. Cho stripped completely nude, while Septima had kept her panties in.
“My tits are better than her tits, aren’t they Harry?” Cho asked. “They’re bigger. We measured. Not to mention the ratio of nipples to surface area falls closer to what wizards prefer. We measured, and compared it to the findings of a Witch Weekly survey?”
“You both have very nice boobs,” Harry said, calmly refusing pick sides, smiling at the women.
Septima’s work with her tongue had finally gotten his dick completely erect. She leaned back for a moment, just staring. Even though she claimed to have believed Cho’s claim about Harry’s size, seeing it in front of her own eyes was still making her draw up short.
Cho wasn’t going to let her mentor get off that easy.
“He’s hard now. Measure it,” Cho said. “I don’t want any excuses after the fact!”
Septima quite visibly swallowed. She fumbled around in the pockets of the robe she’d stripped out of until her hands wrapped around the hilt of her wand. Using it, she summoned a magic tape measure from across the room.
First, she measured his girth. She put the soft tape measure around the base of Harry’s dick and took the measurement. Although it wasn’t strictly necessary, she pressed her cheek into his warm dick while she did so, squinting through her glasses to see the numbers better.
“S-Six and three quarters inches,” Septima said aloud.
She took a deep breath and reoriented in order to measure his length. Cho watched with proud eyes as she took in how her mentor was struggling.
“T-T-Ten inches exactly,” Septima said. She squinted at the tape measure, double checking that she was reading that right. When Harry’s dick was right in front of her, she had a hard time believing this behemoth was “only” that big.
“Very good!” Cho complimented her mentor. “Now scooch, please, Professor Vector. I have a fucking bet to win!”
Cho had to physically push Septima sideways in order to clear enough room to get to Harry’s dick. Briefly, Cho massaged the sides of her neck, loosening the muscles. She looked up at Harry with a smirk.
“Like old times!” she said.
Cho spread her lips and went in for the kill.
She didn’t get it right away. The first time she went down Harry’s dick, she was repelled after the first four inches. Cho controlled her brief gag and made a second attempt, where she took seven whole inches.
From there her progress was more gradual. She gained an inch at a time, then less than an inch. After multiple minutes, Cho was getting so close that she was brushing Harry’s pubic hairs.
Septima watched with astoundingly wide eyes.
Resolution filled Cho’s expression. She looked like she used to when she had the golden snitch in her sights during a quidditch match. She lunged forward and successfully deepthroated Harry’s dick.
Septima cursed, while Cho inched her head back and let Harry’s dick pop out of her mouth. She pumped both her hands in the air.
“I win!” Cho said. “I get to go first!”
“I really thought… Where does she put it all… It’s not fair…” Septima mumbled dejectedly.
Harry held up one hand, looking at Cho with a little bit of exasperation. “I think that I’m missing context again. What, exactly, do you get to go first for, Cho?”
This time, both of the women looked up at him with identical flat looks.
“It doesn’t take complex calculations to understand why so many of our coworkers have needed to take 9 month breaks from work,” Septima said.
“Seriously, Harry. We aren’t dumb or dense,” Cho said. “How do you think the size of your dick first came up?”
“We ran the numbers and decided that it’s our turn,” Septima said. “However, there are two of us. That conundrum meant that one would have to wait slightly longer, a prospect neither of us wanted to deal with. We came up with a bet as our countermeasure.”
“I said I could deepthroat you,” Cho bragged, “and Septima didn’t believe me. So much for that!”
“I should have done more research!” Septima whispered angrily.
Cho got up, grasping both of Harry’s hands. A trickling trail of arousal ran down the inside of her thigh once she stood. Harry’s dick was extremely hard, having gotten a blowjob that stopped part of the way through. He was ready to burst.
“I’m sure you don’t mind this, Harry,” Cho said. “After all… I’m sure you’ve thought about it with me.”
Her impish smile made Harry pull her close, her sexy nude body bumping against his clothes.
“How are we doing this?” was his only question.
“We’ll need a bed,” Septima said. “Cho and I deduced the dimensions of the perfect bed for the most efficient babymaking possible. Let’s see here…”
She sifted in her robes and came out with a piece of parchment. When she read the dimensions and features out loud, Harry listened carefully, before nodding.
He pushed Cho away for a moment. First, Harry took off his shirt, completely stripping. He then found his wand inside his pulled down pants and quickly transfigured three classroom desks into a single king sized bed.
Harry pushed Cho, who stumbled back and fell onto the bed. By the time she adjusted to the fact that she was on her back, Harry had followed her and gotten on top. Septima crawled after him, still wearing her skimpy panties that clung to her rather thick ass.
Septima lay down sideways and watched as Harry mounted her assistant professor. Harry rubbed his tip against Cho’s wet entrance. She couldn’t handle this and moaned out loud.
“In order to ensure pregnancy… It’s best to cum as much as possible, and not waste any,” Cho said, her lower lip trembling as Harry rubbed his dick against her lips.
“Is that so?” Harry asked. “I’d say that backs up my personal experiences.”
Cho trembled as he grasped her ankles and proceeded to fold her. He pinned her feet to the bed, folding her like a taco. Only when this was done did he slam his dick inside of her, completing the mating press.
PLAM! PLAM! PLAM!
True to the “calculations” that the witches had run, this bed had the perfect amount of bounce for a nice sticky breeding. The mattress bounced in exactly the right way each time Harry flattened his crotch and powered his dick inside of Cho. She screamed his name and started to cry from pleasure.
“Those noises lead me to believe, with a high rate of certainty, that she’s about to cum!” Septima said.
The sexy professor was laying on her side. She had pushed her panties to the side to uncover the lips of her pussy, so she could masturbate while watching Harry destroy her lucky assistant.
Cho’s pussy squirted for Harry almost immediately after Septima’s prediction; he didn’t give her any credit. A blind man could have guessed Cho was going to cum, just from the sounds she was uttering.
“FUCK FUCK FUCK MMMAAAAAHHHH! HAARRRRY!”
Plap! Plap! Plap! Plap! Plap!
Harry relentlessly tore up the cunt of his first crush. He could see Cho’s mind breaking with pleasure. By the time he was ready to cum, she was already on the verge of being unconscious.
Harry’s cum splashed into her womb. Even though Septima was waiting for her turn, Harry didn’t stop fucking Cho. He leaned down and whispered in her ear while still pounding her, his cum spreading throughout her pussy while he talked.
“Do you have a calculation for this, too? Maybe a formula that will tell you how likely you are to get addicted to my dick?”
“One hundred percent!” Cho belted out. “I’m ALREADY addicted!”
All of her toes curled, getting strands of her black hair in between them thanks to where Harry had pinned them. He didn’t release Cho from beneath him until he had creampied her three times. He pried himself off of the Asian beauty and left her looking like a complete mess. Harry touched the lips of her pussy and watched a big glob of semen plop out of her.
He turned his attention to Septima. The professor had her panties all the way down around her ankle. There was a wet spot in front of her crotch where she’d squirted. When she moved, she left a slight outline of her body; she’d masturbated so hard that she broke out in a sweat.
“It’s not fair that you gave her so much,” Septima said, crawling toward Harry.
“Even if I give you the same amount?” Harry asked.
Septima crawled on top of him, straddling his lap. She gently pushed him until he lay down on his back, so that she could mount him properly.
“Successive orgasms have been proven to produce inferior semen quantities,” Septima said. “You gave Cho the three biggest loads. You’d better make up for that.”
Harry grabbed her fat ass. He forced her down against his body, where his dick slid straight up into her. Septima gasped and squealed with delight.
“I suppose I’ll just have to cum in you five times,” Harry said shamelessly. “Let’s make it six. To play it safe.”
Even though he was the one on the bottom, he thrusted into Septima, taking control. She was on top and yet she was a passenger. Harry clapped her ass hard, holding onto her thick cheeks. Septima put her hands on his chest to desperately support herself. She quickly started making the same sounds that Cho had.
Plam! Plam! Plam! Plam!
“What’s wrong, professor? Are you turned on by the dick of your old student?” Harry asked.
“I’m a woman first, and a professor second!” Septima screamed. “How could I not be turned on? Breed me, Harry! Knock me up!”
Harry pounded Septima relentlessly. Some time between the second and third orgasms that he delivered, Cho woke up enough to watch. Harry’s first girlfriend watched him breed her mentor while his cum dripped from her cunt.
When she could no longer handle being on the sidelines, Cho leaned over and kissed Harry. She lay on her stomach, thrusting her tongue into his mouth while he tore up Septima’s pussy. They were still like that when he came in Septima for a fourth and fifth time.
Eventually, Harry got tired of staying on the bottom. He lurched up, putting Septima on her back. Instead of getting on top of the curvy professor, he pulled Cho over.
Harry made Cho sit down across her mentor’s face. Cho’s pussy was right on Septima’s face, which inevitably led to Harry’s cum dripping out, right into Septima’s mouth.
She was given a literal taste of his cum, the same substance roiling around inside of her, before Harry delivered a sixth orgasm straight inside of her.
All three of them hit their limit at the same time. Septima had put her tongue inside of Cho, which was enough to make Cho cum. Harry poured a final load inside of Septima. And Septima, unable to handle the pounding from a cock of Harry’s size, squirted on him for what had to be the tenth time.
They fell apart, breaking the strange triangle they had ended up in. Septima lay on her back looking at the ceiling, Cho and Harry sitting on either side of her. All of them were sticky and tired. Harry’s cock was finally starting to lose blood, shrinking from the proven ten inches that it stood at when erect.
Septima’s eyes drifted up, meeting the gaze of her assistant.
At the same time, speaking in the same tone, they said:
“Another hypothesis successfully tested!”
Harry could only shake his head.