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One-Shot: Taking Malfoy’s Sister

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“Hermione, who is that?”

The Gryffindor bookworm followed his gaze across the Great Hall to the Slytherin table where an older blonde ate quietly.

“That’s Kassandra Malfoy, Head Girl.”

She was definitely the most beautiful woman Harry had ever seen, in a league of her own compared to the other girls at Hogwarts. It wasn’t just her body that caught his attention, which was definitely amazing with the way those huge breasts filled out her dress shirt, or how her wide hips were hugged by her skirt. Her face was aristocratic and intimidating, with platinum blonde hair that made her look like an angel.

Despite this, he could sense the magical power she possessed underneath, along with the mature and cold temperament that few could tame. As Hermione had stated, she was Head Girl, meaning she was the valedictorian of Hogwarts, and likely one of the few in Britain that came close to himself in terms of sheer ability.

Ron couldn’t help but turn at the mention of ‘Malfoy’, a sour expression appearing on his face despite how gorgeous the girl in question was.

“Malfoy’s sister?” Ron looked sick. “And a Slytherin as well? Better keep your distance from that one, mate.”

Harry strongly disagreed. With the upcoming Yule Ball, he needed a date, and more than that, it seemed he had finally found someone compatible.

Blonde and beautiful, powerful and from an old family, and accomplished enough in academics to be Head Girl? He could tell she was a powerhouse in the making, someone who might even be as powerful and influential as himself in the future.

Whether it be politics, magic, or sex, Harry wanted someone who was his equal to be his partner in life. It was a darker desire he had awakened, starting right after everyone shunned him after he was selected Champion. He had only used that hatred directed at himself to fuel his resolve, to better his magic to the point he breezed through the first task.

Dropping a Hungarian Horntail with the sheer power of his magic made the school’s attitude towards him do a complete turnaround. Now the boys looked at him with awe, and the girls bit their lips and fluttered their eyelashes at the sight of him. And it had made him feel almost lonely, to be in a league of his own and know that no one would measure up.

So he did the rational thing, and decided to ask the Head Girl, the most powerful student in Hogwarts, to the Yule Ball.

/////

Harry Potter kept looking at her.

It wasn’t the usual glances or lustful stares from the trolls in her year that she was accustomed to. But rather it was the hungry gaze of those alluring green eyes that Kassandra could get lost in, constantly analyzing and tracking her movements.

It went on for days, as if Potter was drinking in every last detail about her life. All the while she felt naked, like a rabbit lost in the wilderness about to be pounced upon by a lion. She knew she shouldn’t have felt that way, especially when it was a half-blood gloryhound like Potter.

Yet she couldn’t help but freeze in place when he finally approached her, his green gaze luring her in as he approached her in an empty hallway.

“I want you to go to the ball with me.” The words were spoken with intent, not arrogance, as if he was talking about the forecasted weather.

She should’ve humiliated him in that moment, insulted his poor blood status, or even his younger age. Instead she found herself lost for words, barely able to force herself to raise her chin arrogantly. “What makes you think I would go to the ball with the likes of you?”

He grinned as if amused, like she was a child and this conversation already had a foregone conclusion. “The two of us are the strongest mages in this school, and it would only make sense for us to be together because of it.”

“There is more to relationships than one’s magical power, Potter.” She stated, all while knowing what he was saying was true. The first task had proved his magical might after all.

“Whether or not you agree to go to the ball with me doesn’t change how things will end between us, Kassandra.” He used her name without a care.

Her lips quirked up, as if indulging him. “And how will things end?”

He stepped closer, his gaze making her feel like an ant against his power then. Kassandra was no longer smirking, her body still in place. “It ends with you at the end of my cock.”

He moved away and down the hall without looking back then, all while she stayed still. Her limbs felt frozen, eyes wild as adrenaline pumped through her veins.

That wasn't the Harry Potter she knew. Or at least knew of. The one her brother bullied, who received special privileges and House points from Dumbledore on a whim, who was the Gryffindor Golden boy.

She had gotten a glimpse of the true Harry Potter in that moment, the monster that laid underneath the exterior, hiding away until he finally found his prey. And it seemed he had set his sights on her.

/////

The game was a blowout.

Typically the Gryffindor and Slytherin games were down to the wire, or a nauseating sway of scoring where one side drastically got the upper hand before the other made its comeback. But not this time.

Harry Potter single-handedly dominated the Slytherin team, crushing them and enchanting the crowd with his signature smirk as he caught the quaffle and scored goal after goal atop his firebolt.

He wasn’t even a chaser, yet there was no rule against the seeker touching the quaffle or scoring goals. In fact, it was further embarrassing that he wasn’t supposed to even touch the quaffle in the first place.

And despite doing the work for all three chasers, he still caught the snitch at the end, bringing the score to an embarrassing 430 to 70 in Gryffindor’s favor. It wasn’t an official match, just a simple game put on to pass the time between the first and second task. Despite this, the population of all three schools had turned out to watch, much to the further embarrassment of Slytherin House.

She watched as Potter landed and was soon enveloped by all three female chasers on the Gryffindor team - much to envy of every girl in attendance. Angelina Johnson ended up clinging to Potter’s side, looking at him like a god all the while as the rest of the team congratulated him and the audience cheered wildly.

It was as he was leaving that his eyes somehow found Kassandra’s own in the crowd. Her back went ramrod straight, staring back at those gorgeous emerald irises before he sent her a wink and continued out. She didn’t miss the way his hand rested on Angelina Johnson’s lower back all the while, sinking down to grope her one of her cheeks as they walked out.

It was as the humiliated Slytherins made their way out of the stadium and back to the castle that she broke off.

“Kassandra?” One of her year mates asked as she walked away from the main group.

“I have some things to attend to, and will meet you all back at the dorm.”

Probably going to give her brother moral support.” One of her Housemates quipped, guessing she wanted to comfort her brother after his humiliating defeat.

I think she’d sooner bite Draco’s head off than actually do that.” Another said.

She turned it out, her blonde hair swaying in the cold wind as her legs carried her quickly, navigating around the Quidditch pitch to the locker rooms. It was like her body was under the Imperius curse in that moment, moving with a mind of its own.

She opened the door to the hallway that connected the separate locker rooms, walking inside for several steps as she opened another door to the girls locker room. It was empty, except for the running of water in the background, along with another noise that made her freeze in place.

PLAP PLAP PLAP PLAP

The sound of shower water splashing was drowned out by the deafening slapping of skin. The noise of a woman getting fucked hard, her ass pounded red. Then there was the screams of pleasure.

“OH! HARRY! FUCK-GAH! Y-YOU’RE SO BIG! AAAH!” She heard the unmistakable voice of Angelina Johnson screaming at the top of her lungs in pleasure.

Kassandra’s breaths came shallow, her body nearly quivering as she risked a peek around the corner and into the women’s shower.

A fit male bum greeted her, attached to a muscular back and powerful arms that gripped a big dark booty. She could see from behind as Harry Potter’s fingers dug into Angelina Johnson’s thick hips, her fat slab of ass pounding and shaking against his thighs as he thrusted powerfully into her. More than that, she could see her soaked and sweaty body, big tits freed and bouncing beneath at the force of his thrusts.

“HHUUUAAAGGHHH!!!” Angelina screamed to the heavens as if she was being exterminated, clearly undergoing an orgasm that was ripping her apart. “BY THE GODS HAAAARRRY!”

The noise brought Kassandra back to the real world, pulling back and spinning in place before she practically bolted from the Quidditch locker room.

The memory of Harry Potter taking the beautiful chaser would haunt her for weeks to come, and the events at the Yule Ball would only make things worse.

/////

She had decided to go to the ball with Cedric Diggory, more as to keep up appearances than anything else. He was the Hogwarts Champion, while also being her counterpart as Head Boy, meaning no one would bat an eye at the explanation of them not being romantically involved.

Furthermore, everyone in attendance knew she was too proud to be involved with a Hufflepuff of all people. That, and the fact it was a public secret that Cedric Diggory had a hippogriff-sized crush on Cho Chang, and was apparently too nervous to ask her. It had been Professor Sprout that organized the Head Boy and Girl going to the ball together, seemingly taking pity on him.

“Mr. Potter, I see you’ve finally arrived.” McGonagall said as the last Champion appeared.

“Indeed I have..” She could hear the smirk in his voice. “And might I say how lovely you look tonight, Professor.”

“Hmph.” McGonagall groaned. “You’ve become too much like your father as of late!”

Kassandra kept her expression carefully neutral as she turned to face Potter while he approached. He easily caught her look, his smirk widening, before he moved up beside Fleur Delacour of all people.

Annoyingly, the Veela seemed absolutely delighted to have Potter on her arm, looking at him as if he was the male Adonis. The sight of the two together made Kassandra more irritated than she was ready to admit, eyes narrowing in anything but envy.

They all walked into the Great Hall to loud applause, eventually taking their place to sit and eat at the head table with the other Professors and judges.

Still, Kassandra struggled to hide her annoyance throughout dinner, subtly watching the way Fleur Delacour seemed hung up on Potter’s every word. The Veela threw herself at him, pressing her bust against his side and giggling unnecessarily. She acts like a whore.

Soon they stood for the first dance, and it didn’t help her mood that she noticed Potter’s hands wandering over his partner’s body. His fingers grazed over her ass while the Beauxbatons Champion whispered sweet nothings in his ear, the two dancing like they were meant to be together.

No occlumency could hide her scowl as she left Diggory as soon as the opening dance was over and sat back at the head table. She didn’t know why she was acting like this over one boy, why he was driving her insane, why she-

“Lady Malfoy, may I have this dance?”

It made her mad to think she hadn’t predicted this, because of course Potter would ask her for a dance. On the other hand, she felt a strange happiness that he did so. His dominating green gaze stared down at her as she accepted, soon entering the dance floor and getting lost in the music.

She kept her mouth shut as they spun, both their movements oddly synchronized in a way that just felt right.

“A shame you didn’t go with me tonight, Kassandra.”

She tried to glare at his insolence. “And what do you think others would say if they saw me on your arm, Potter? What my parents would do to me?”

“So it’s your parents you’re worried about?” He asked with a raised brow.

She only glared back at him, mentally cursing the Gryffindor Golden Boy for getting her in this situation.

“Still, it’s as I told you before, things between us will only end one way.”

With me mounted on your cock. A contemptible snort left her nose. “You and that Veela whore seem quite close, are you sure she’s not a better option for a cur such as yourself?”

“It’s as you said, she’s nothing but my whore.” He smirked, not rising to her bait. “You can always watch us later if you want? Just like how you watched me pound Angelina’s ass red.”

She tripped, but Potter easily steadied her, making it look like nothing happened as she returned to their rhythm. “W-What?”

“Don’t act like you don’t know, my proximity ward told me you were there.” He continued smirking. “Not that I needed it, as I knew you wouldn’t resist the opportunity to watch.”

“A-And how would you know that?” Her voice was shaky.

“Because I knew you would be curious to see the ability of the wizard who will be fucking you for the rest of your life.” Their dance came to an end, as they stood at the edge of the dance floor. “If you want to see more, come to Fleur’s room in the Beauxbatons carriage later. I’ll be sure to make sure she doesn’t walk straight for the rest of the week.”

He left her with having spoken the last word.

/////

She didn’t go to the Beauxbatons carriage.

She didn’t change out of her dress, laying in bed with the curtains closed and her makeup still in place. Kassandra didn’t know how long she laid there, staring up unblinkingly as a million thoughts about a certain dark-haired wizard raced through her mind.

It must have been the middle of the night by the time she moved, turning over to watch as a letter floated through the gap in her bed’s curtains to land in her lap.

She opened it, finding the first page had a small note written on it.

I knew you would still be awake. Since you didn’t show up, here’s some of what you missed.

Potter had written it, she guessed that much, putting the note aside and pulling out the next item from the envelope which happened to be a magical photograph. She looked at it and gasped, blood nearly freezing in her veins from shock.

Fleur Delacour looked absolutely wrecked in the photo. Eyes rolled up in pleasure, body arched, hair loose and covered in sweat. Her tits were big, huge compared to most witches, and Kassandra could barely say hers were larger.

But it was the bottom part of the moving picture that drew Kassandra’s attention. Delacour was trying desperately to impale herself on a wizard’s cock, with only an inch sticking out that she failed to get inside. The cock was massive, its sheer girth stretching the Veela obscenely and its length obviously being quite substantial.

“Fuck.” She was already wet. Soaked. Just touching her fingers to her core felt like poking a volcano that was about to erupt.

The moving picture only seemed to have more unexplored details the longer she stared at it, such as the impression of Potter’s shaft bulging out Delacour’s belly. Or even the way that the Veela seemed desperate to impale every inch inside her, all while finding he was simply too massive to fit.

“J-Just how big is he?” She had heard Angelina Johnson’s wrecked screams, and now seen this ludicrous picture of a destroyed Veela. Her mind began to conjure up images of what his manhood could look like, yet even her imagination didn’t seem to make it big enough. “He really destroyed a Veela…”

Her core felt like it was combusting in on itself, soaking through her dress which she still wore, leaking onto the bed below. It was as her hands played with her core and more fluids squirted out, that Kassandra Malfoy knew she would never be able to wear that same dress ever again.

/////

Potter’s next move came a month after that. Or rather, it came from Potter’s whore.

“You are ze one ‘Arry spoke of, non?” Fleur Delacour asked her.

The Veela had literally limped her way over to Kassandra’s spot in the library, no doubt caused by Harry and his sizable manhood..

Her eyes narrowed. “Whatever you want, make it quick.”

The French whore only laughed. “Oui, I can see why he wants to break you. Those lips of yours will look lovely when wrapped around his cock.”

She pronounced the last word with a pop that went enticingly well with her French accent.

“Leave, I don’t have time to deal with whores.” Kassandra nearly snarled.

“Ah, I almost forgot.” Delacour seemingly pulled a letter out of her bra before handing it to her. “ ‘Arry sends his regards.”

She took it as Delacour walked away with a limp.

She knew she should have burned the letter right then and there. Or even taken it to Snape to get Potter suspended.

Yet instead she practically ran back to her dorm, core dripping as she shut the curtains around her bed.

She opened the letter with shaky hands, expecting to see another moving photograph of Delacour getting her back blown out. Instead she found something a lot more surprising.

Wanted to find out if the DMLE had any leads on my name coming out the Goblet, so I talked to the Director’s niece.

It was Susan Bones in the photograph, covered in seed with tears rolling down her face as she looked up at the camera. Her big tits were exposed, and wrapped around the sides of Potter’s cock as he filled her mouth. She could see it in the ways her lips strained to wrap around his girth, cheeks bloated with man meat as sweat fell from her red hair.

The redhead was covered in sweat and thick white seed. It almost looked like Potter had dumped a gallon jug of cum on her before taking the photo, and it left little to the imagination in terms of how long they had been going at it.

She could see more of his cock in the photo this time, revealing it to be much thicker than she initially thought. And not just its girth, but length, as he completely filled Susan’s mouth with at least the front half of his cock while the rest was getting a tit massage.

Morgana, he’s huge. Kassandra could now understand just how Fleur Delacour could be reduced to a quivering mess by a cock of such size.

And then there was the note, that Potter intentionally got with the niece of DMLE Director Amelia Bones to get some information. She wondered if that was actually true, or if Potter simply wrote that to impress her.

Either way it was working, as her more ambitious Slytherin side was left feeling very impressed. She had always wanted a man with such inclinations, and it only made her desire for Harry Potter grow stronger.

/////

The next letter from Harry came a week before the Third Task of the Triwizard Tournament. Her heart had thumped hard in the confides of her chest as she raced down to her dorm after receiving it from his snowy owl in the Great Hall.

Her panties were already halfway down her thighs and Harry’s name coming out in moans by the time she slammed her bed’s curtains closed. The letter fell out of her shaky hands three times before she managed to breach the seal, opening it to see it was the same format as the ones before.

You said your parents wouldn’t approve of us. How about your mother?

Her brain barely comprehended those words before she pulled out the photograph included in the envelope.

What she saw shouldn’t have been possible.

A gorgeous older blonde woman was getting fucked, Harry’s massive cock slamming in and out of her. From the bottom the camera captured the base of his shaft entering between the two large cheeks that clapped against his thighs, with those same cheeks and lower back exposed and already covered in thick seed. Above that was long blonde hair let loose, bouncing lightly with each thrust.

Midway through, Harry pulled out with his cock going to hide out of frame, before flipping the gorgeous woman over. Kassandra’s heart slammed hard against her ribs as she instantly recognized her.

Narcissa Malfoy. Her own mother was fucking Harry Potter.

The aristocratic pureblood familial features stared back at her before a thick wave of white seed erupted out of frame. Insane amounts of thick wizard cum splashing all over the woman and dousing both heavy tits in one go, before the next coated her entire face, and then the last covered her stomach and core.

She panted the longer she watched it play out, only for the moving photograph to reset to the beginning, where Narcissa Malfoy was getting fucked from behind doggy style.

It was the next time when Harry flipped the woman around and coated her, that Kassandra screamed and came. Not the orgasm she was reduced to where she shook and came, but a full blown meltdown as her back arched and fluids squirted out onto the bed from the force of her release.

/////

It was like a switch had been flipped after that last letter.

No longer was it Harry Potter eyeing her with lust, but now Kassandra was the one staring at him from across the room. She wanted to know how he had accomplished all this, how he had taken her Mother, how he had chosen her out of all others. More than that however, she wanted him to finally take her.

Then came the Third Task, and the impossible happened.

Harry returned with the cup in hand, slightly bloody and scarred, but none of that was the surprising part.  Voldemort and Peter Pettigrew hung off his arms. Or at least a very wounded Pettigrew - who was supposed to be dead - along with a disfigured baby-form of Lord Voldemort.

His eyes met hers briefly as he conversed with Dumbledore and the bumbling Minister. Soon enough Director Bones showed up with a handful of aurors to take the Dark Lord away.

After that Harry became the nation’s hero, and suddenly he was far too busy dealing with the press and meeting with Dumbledore privately to deal with her.

/////

Not even a day after they arrived home on the Hogwarts Express, and Harry was already back in her life.

Her parents had presented him with her marriage contract, along with an astonishingly low bride price for a witch of her caliber. It was Narcissa Malfoy’s doing, who clearly had orchestrated the paperwork ahead of time, along with whatever promises her father made Harry so he could stay out of prison.

In a way, the Man-Who-Conquered had her mother by the pussy and her father by the balls. One word and Lucius Malfoy would be off to Azkaban, all while Narcissa Malfoy was busy sucking his cock. It only made sense that he would claim their daughter in order to complete the set.

She would be his wife when he graduated in a few years, but that didn’t mean they couldn’t be together until that time.

Kassandra Malfoy was embarrassed to say it was her who dragged him upstairs to her bedroom in Malfoy Manor, passing by her red-faced and fuming little brother along the way. She was too occupied to tell him off, nor to reprimand her betrothed for subtlety taunting him by giving her fat ass a playful slap.

She desperately wanted her clothes off, and began undressing the second her door was closed. Harry was much the same, albeit being smarter and using wandless magic to vanish her own outfit first.

From there his hands were all all over her as she moaned. Her breasts, so big and shaped like teardrops, overflowing Harry’s hands as he groped them and whispered in her ear how they were the largest he’d ever held. Her round ass grinded against his trousers all the while, the outline of his cock pressing hard against her core through the fabric.

She was a slut. His slut. Moaning and begging as her core literally dripped all over him. She could see the effect it was having, how his pupils became enlarged, his breaths starting to come out in low growls.

Within moments she was on her back in bed, with her legs wrapping around Harry’s body as he used wandless magic to remove his garments.

All of his clothes were finally gone, and that was when she saw it. A behemoth of a cock big enough to break any witch, thick and long enough that it made her quiver. Below it rested his immense ballbag, two large sacks filled with cum that could breed for days on end.

“B-By Morgana…” Her words escaped in a shaky gasp.

She could see the way he relished her expression, the way it made his shaft twitch. He pushed his cockhead against her leaking pussy, parting her lips as he began to push inside.

“G-Gods… I-It’s so big…” She writhed as he fed himself into her.

“Take it.” Harry’s voice was deep, almost sounding inhuman. Not a shred of sympathy would come for her as he pushed in inch after inch. “Be a good girl and take my fucking cock.”

“aah~” Her head shot back, her first orgasm ripping through her.

Mid way through it his hands landed on her tits, squeezing and massaging them in a way that caused her to see stars. It only made the pleasure that much more intense, a blur of sensory overload as he shoved himself into her.

By the time she came back, Kassandra found herself on her hands and knees. More than that, Harry had embedded himself all the way to the base.

She felt so full that she would explode. Enough cock embedded in her cunt that it would come straight out her throat. He let her sit there, get used to his size before he truly began to fuck her.

“You did such a good job, taking all of it.” Harry’s hands ghosted over her hips in a way that made her hairs stand on edge. “I knew my time wasn’t wasted on you. Now it’s time for me to make this tight cunt my own.”

He pulled back, and then back some more. Inch after inch until almost a foot of meat was out of her with his cockhead was still embedded inside. That was when he slammed forward, the movement making spittle erupt from her mouth as she saw white.

PLAP PLAP PLAP PLAP

A beast, that was what her future husband was. Nothing more than a sex-starved beast that enjoyed destroying witches like her. And she felt it in the way he gripped her lips, his rock-solid muscular thighs slamming against her bum over and over.

“That’s it, you fuckin’ bitch.”

SMACK

“Gah!”

He had given her ass a spank, making her cry out.

“Cum on my fucking cock.”

“Y-Yesss!” She got out brokenly, following his orders as her body exploded onto his shaft, her feminine fluids flooding her core and leaking out of her stuffed pussy to land on the bed below.

“Haha!” He laughed as he took her, hand moving up to grab her perfectly manicured platinum blonde hair. That same hair was her pride and joy, the part of her body she valued most, yet Harry gripped it so carelessly.

“Look at you, Malfoy’s sister, coming on my cock. What would he do if he could see you now?”

He spoke calmly even as he fucked her brains out, and even that didn’t seem like the right description for what he was doing to her at that moment.

“D-Draco would AH! - Hate me!” She got out between ragged gasps.

“Maybe I’ll call him now and have him walk in on us.” His grin seemed to become demonic as he looked down at her. “Maybe I’ll tie him up and make him watch as I take you and Narcissa at the same time!”

“F-Fuck please…” She begged as her walls squeezed around him for the umpteenth time, visioning blurring as her orgasm was propelled by his filthy words.

“Damn, here it comes.” She could feel his length twitching inside her, before it seemed to get even bigger. The noise of flooding seed could literally be heard, ungodly amounts of cum being pumped into her as he slammed himself to the base.

It was like she was stuffed pregnant with thick wizards jizz, no doubt able to get her pregnant many times over if she wasn’t already on the potion. But just when she thought it was over, Harry only fucked her harder, making her scream as her moans and yells of ecstasy were heard throughout Malfoy Manor.

In their separate bedrooms, Lucius seethed at the sound of the man who defeated his Master also defiling his daughter, while Narcissa only smirked and fingered herself harder.

In his own room, Draco Malfoy was a mess of tears as his enemy achieved the greatest humiliation he possibly could over him. He tried to fall asleep, to make it stop, yet the sound of feminine screams and pounding flesh seemed to reverberate through the walls themselves.

In the end, Harry Potter had achieved everything he ever wanted. And then some.

Disclaimer: All Characters are over the Age of 18

A/N: Needed a break from the normal upload schedule, so here’s a rare one-shot to enjoy. For those wondering, the next chapter of The Greengrasses is on the way

RougeAtomic PATREON 256 favs
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POSTEDMay 30, 2026
ARCHIVEDMay 30, 2026