Knicker Knight
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Growth Spurt Chapter 37
🕑 Added 2025-02-03 04:38:42 +0000 UTCOne week later on the dot, Harry was climbing the Astronomy Tower again, this time with a different book in hand. He was determined to be more careful with this one. The dueling book he brought to the last detention session had ended up partially ruined after Romilda squirted on its pages. Harry had to tell Madam Pince that he spilled a drink on it; a single spell got rid of the damage, but the librarian had still given him a very thorough lecture.
When Harry arrived at Sinistra’s classroom, he found it empty this time with the exception of the professor herself.
“Come in, Harry,” Sinistra said.
She had a book of her own open on the desk, but she barely seemed to be reading. When Harry walked over and sat down in the same seat that he used a week before, she followed him with her eyes the entire way.
“Are you feeling alright Professor?” Harry asked.
Sinistra coughed. “Certainly!” she said. “Just go ahead and read.”
Harry did exactly that. But something about the atmosphere felt strange. He was unable to help sneaking glances at Sinistra, and every time he did he spotted more things that made him suspicious.
Half the time, when he looked up, she was just staring at him, but she would always look away quickly. The rest of the time she was “reading” but this was suspicious too. Harry was just barely able to see the page she was on, when he crooked his neck. It was the same one every time, even after he’d been in her classroom for thirty whole minutes.
“Are your classes going well, Harry?” Sinistra asked.
“As well as I could’ve hoped,” Harry said.
“That’s good,” Sinistra said. “You know, if there’s anything you ever need help with, I’m always glad to help.”
“Thank you,” Harry told her, but he couldn’t help but frown at the same time, because her actions weren’t matching her words.
Sinistra was leaning forward as she spoke, almost as if she thought he was hard of hearing. Her expression looked almost nervous. Suddenly, Harry’s eyes bulged.
Sinistra had leaned forward so much that her robes were hanging down, letting him see down the collar. There was no bra underneath. Harry could see Sinistra’s nipples, even darker than her skin, as well as the rest of her small breasts.
“You’re too kind, professor!” Harry said.
“It’s no trouble,” Sinistra said, sitting up straight and looking away. Harry couldn’t tell if that had been a mistake or not. Surely she couldn’t be…
“What made you choose Astronomy as an objective?” she asked.
“To be honest, Professor? Because Ron and I thought it would be easier than the others,” Harry admitted.
“I’m hurt,” Sinistra said. “You mean it wasn’t any deep love of the subject?”
“Well, I mean… No,” Harry said.
“That won’t do,” Sinistra said. “Hold on, I’ll instill a bit of wonder in you yet.”
She stood up, making her robes swish, and walked over to a large star map pinned up on the wall. As she did, though, her robes caught on the corner of the desk, riding up.
Just for a single second, Harry was able to view what was underneath. Dark thighs went on for miles, all the way up to the hip. Just like on her chest, there was nothing underneath her robes. Harry made his mind up.
Sinistra, the hottest teacher at the entire school, was one-hundred-percent teasing him.
She began to talk about the star map, explaining facts and pointing things out, but Harry was hardly listening. Instead, he paid attention to the tremor in her voice. He noticed how her fingers were shake slightly. She was nervous… and EAGER.
He stood up. This time, he left his book behind at his desk. There was no way he was getting ANOTHER library book into the firing line.
Sinistra could hear his steps, but she carefully did not look at him. She smelled good up so close, like nutmeg. Harry reached out, cupping her bum.
Sinistra yelped. She stopped talking, but didn’t say anything else as she felt Harry knead her body through her robes.
“Don’t mind me,” Harry said. “Keep talking.”
Sinistra whimpered, but did as he commanded.
“This was caused by a supernova, which is a phenomenon where…”
Harry was still barely listening. Just from touching Sinistra’s expansive, gooey ass, even with robes in the way, his dick was almost painfully hard. Every boy in the school knew Sinistra as the hottest teacher on the staff. She had exotic dark skin. Not like Tracey’s or the Patil Twins’, which was a toasty brown. Sinistra’s skin was extremely dark; nearly black. She had wide hips, thick thighs, and the best ass in Hogwarts. It was even better than Fleur’s. Harry squeezed, feeling his fingers leave indents in what he and so many other students had fantasized about.
“I saw you, last week,” Sinistra admitted quietly.
“I’m sure you did,” Harry said. “Did you even have a meeting at all, I wonder? Or was it all a dirty little excuse? You wanted to watch your students, lusting after them…”
“No!” Sinistra whimpered as his grip tightened. “I really did have a meeting!” she moaned. “But by the time I got back, you guys had started.”
“And the ways you were teasing me?” Harry asked. “You flashed me the same way as Romilda and Tracey. You couldn’t tell your student that you wanted this, but you were willing to show off your body, hoping he would pounce on you. Well, he pounced.”
Harry pushed forward. Sinistra grunted as her cheek was flattened against the start map she had been explaining the intricacies of. Harry planted one hand on the middle of her back, while the other one grabbed her between the legs. His fingers squeezed, grinding her robes against her entrance.
“I’ll bet you fantasized about this all week,” Harry said.
“No!” Sinistra moaned.
“Be honest.”
“I didn’t… It wasn’t… Only a little bit!” Sinistra cried.
Harry smirked. He tightened his grip. Without removing her robes he flexed his fingers, squeezing with so much force that Sinistra’s toes curled. She began moaning for real, not even managing words. His fingers scraped her through her clothes, using force to make up for the lack of penetration.
Sinistra’s back flexed underneath Harry’s other hand. He could feel the muscles there tense, which was followed by a plaintive and wanton moan. Moments later her body sagged. If it wasn’t for Harry’s hand holding her in place, he doubted she would have been able to stay up.
Only when he was sure there was strength back in her legs did Harry yank his hand away. Sinistra waited obediently, not moving a muscle even without Harry holding her still, as if she was fishing for his approval. Harry couldn’t help but grin. Who knew the professor had such a dirty side?
Harry loosened her robes, then began pulling it off her body with deft motions. Sinistra’s robes slid down her dark back, then flopped over her womanly hips. She was left naked, still shoved against the wall, with her body on display. The position showed off her pussy, which Harry could see glistening orgasm remnants all over.
There was always only one thing he would do in this position. Harry straightened his fingers and brought down his palm directly on Sinistra’s incredible ass.
It jiggled in mesmerizing patterns while the professor whimpered from the stinging. Harry landed more blows. Because of her skin color the flesh never turned pink or red, but Harry was sure it would have.
As Sinistra released another long and low moan, Harry finally reigned himself in and moved on. He stepped up directly behind her, close enough for the hairs on his legs to brush Sinistra’s body. Now, Harry wrapped his hands around his thick cock, and using it like a club, beat Sinistra’s pussy.
His meat smacked against her wet lips. The sound was loud, almost as loud as the blows from Harry’s hand. He hit her multiple times, until her sensitive flesh was tender and ready.
There was zero warning before Harry thrust his dick inside Sinistra. He’d gotten her tender and ready, and now it was time for the main event.
As wet as the exterior of her pussy had been, the inside was ten times nicer. Harry slid all the way inside effortlessly, his dick gliding through her inner walls. And then, when the thrust was finished, he collided with that wonderful ass. The effect was almost like a trampoline, as if he bounced backwards, allowing him to begin the next thrust.
“Do you like your students dick?” Harry teased.
“Don’t say that!” moaned Sinistra.
The professor was usually cool and aloof, but her voice had now taken on a girlish quality. She sounded frantic, and she clearly wasn’t in control. Which was exactly how she wanted it. It was easy to see how much she was enjoying herself as Harry ravaged her thoroughly from behind.
His hand caught her long, braided ponytail as it flopped and flew around. He yanked it back, while at the same time re-planting his other hand on her back. This way, he could pull Sinistra’s head back, yet keep her pressed to the wall. Her arms were extended out, her hands planted flat on the wall for stability.
“Why can’t I say it?” he asked. “It’s true, isn’t it? You seduced your student. There’s no reason to pretend that isn’t true.”
“Please…” Sinistra moaned.
Harry couldn't tell what it meant though. Was it her saying to please stop talking? To please stop teasing her? Or did it mean please don’t stop stuffing her with his dick?
Harry listened to the first two, going quiet, so that he could focus on fulfilling the third option.
He put all he had into his thrusts. They collided with Sinistra’s body with so much force that Sinistra was forced to go up on her tiptoes. This then made her pussy jut out toward Harry, letting him reach even deeper inside of her. Sinistra screamed as she felt his dick fill her completely.
The map she was being pressed against rattled, coming loose on its screws from the sheer force of their lovemaking. Harry was grinning. There was something to be said for mature witches, he’d decided. Something about their bodies was just different: softer, more accommodating, and more experienced. Despite doing nothing but taking his dick, Sinistra found ways to do little things, like wiggling those amazing hips, that made the whole thing even better for him.
“When was the last time you were fucked like this?” he had to ask.
“Don’t… know…!” Sinistra gasped. “Don’t stop!”
Harry stepped forward, making Sinistra’s face slide up the wall. She moved from being bent over to standing up almost straight, but Harry didn’t stop fucking her. The new angle made her scream, and cum seconds later.
He pulled her head back using her hair, turning her so that her face was looking directly up. And then, in that position, he kissed her from above.
Here he discovered another thing that experience was good for. Sinistra’s tongue, even in this position, kissed him back more skillfully than any girl he’d been with. She taught him tricks he would have to remember, and she did it without even trying. Harry released her hair and grabbed her dark throat with both hands just underneath the chin. With his hands here, he pulled out of his professor and released his load.
His cum landed all along the crack of her lovely bum, all the way up to her lower back. It dribbled down her body, and when it got to the wide crescent that was her ass cheeks, it dripped off onto the floor like water spilling over a waterfall. Harry was unable to resist giving that bum another smack, making some of his semen fly off.
Whether it was the feeling of his load on her back, or if it was the sudden blow he laid on her, Sinistra orgasmed again. Her legs shook, but didn’t give out, while liquid trailed along the interior of her thigh. She sucked in a deep breath, then kissed Harry passionately one more time.
“How long are these detentions again?” Harry asked.
“One hour. Every week,” Sinistra said, staring up into his eyes.
“I better not be late then,” Harry said. “After all, we don’t want to waste any of our time.”
Sinistra spun around. Harry stepped forward. They fucked for the rest of the time that night, and when Harry was dressed and heading back to the common room, he already couldn’t wait for next week.
