Fluid Dynamics
The late October sun hung low and heavy over the Scottish highlands, casting long, golden shadows across the grounds of Hogwarts. Inside the Hufflepuff common room, the atmosphere was a warm embrace of earthy tones, overstuffed armchairs, and the perpetual, comforting scent of baking bread and woodsmoke.
YN YLN sat tucked into a corner alcove, her legs curled beneath her on a velvet cushion. A stack of Advanced Potion-Making texts formed a precarious barricade around her, but her attention wasn't on the properties of moonstone. Instead, she was staring out the round, ground-level window, watching the dandelions dance in the wind.
YN was a Sixth Year, just like the boy currently leaning against the mantelpiece across the room. She adjusted her glasses, her dark hair falling over her shoulder as she tried to subtly glance at him.
Cedric Diggory.
He was laughing at something his friend Malcolm had said, that easy, bright laugh that seemed to make the room five degrees warmer. To the rest of the school, Cedric was the handsome Prefect, the Quidditch Captain, the boy who could do no wrong. To YN, he was the boy who had once spent three hours helping her find her lost toad in the rain during their second year, ruining his shoes in the process without a single complaint.
He was her best friend. And, for the last six months, the secret architect of her daydreaming.
"Earth to YN," a voice called out, breaking her reverie.
YN jumped, knocking a quill off the table. Cedric was standing there, his grey eyes crinkled with amusement, holding two mugs of hot chocolate.
"Careful," he grinned, setting the mugs down on her table. "You looked like you were trying to telepathically communicate with the Giant Squid."
"I was contemplating the complex social hierarchy of grindylows, actually," YN lied smoothly, accepting the mug. She wrapped her hands around the warmth. "Thanks, Ced."
"Anytime." He pulled up a wooden chair, turning it backward to straddle it, resting his chin on his arms. "You’ve been staring at that same page of Libatius Borage for forty-five minutes. I timed you."
"Creeper," she teased.
"Observant Captain," he corrected, his grin softening. "You’re stressed about the Potions essay?"
"Snape is looking for a reason to fail me," YN sighed, finally looking at the parchment. "He stared at my draught of peace yesterday like it was personal insult to his ancestors. If I don't nail this essay on fluid dynamics in brewing, I’m toast."
Cedric reached out, his fingers brushing against her hand for a fleeting second as he tapped the book. "You’re the best potioneer in Hufflepuff, YNN. Snape’s just miserable because... well, because he’s Snape. You’ll be fine."
"Easy for you to say. You charm the quill right out of the teachers' hands."
Cedric’s expression grew a little more serious, though the twinkle remained in his eyes. "Not all of them. I still haven't managed to charm the one person I actually want to impress."
YN’s heart did a traitorous double-beat against her ribs. She took a quick sip of chocolate to hide her face. "Oh? And who is the unfortunate soul immune to the Diggory charm?"
He looked at her, holding her gaze a beat longer than usual. The noise of the common room—the exploding snap games, the chatting first years—seemed to fade into a dull hum.
"It's complicated," Cedric murmured. Then, shaking his head as if clearing a fog, he sat up straight. "Anyway, I didn't come over here just to distract you from your academic doom. I have a proposition."
"Is it illegal?"
"Not strictly."
"Does it involve waking up before dawn?"
"Ideally, no." Cedric leaned in closer. "Hogsmeade weekend is coming up. Saturday."
YN nodded slowly. "Right. The first one of the year."
"I was thinking," Cedric started, looking down at his hands—hands that were usually so sure on a broomstick but now fidgeted slightly with a loose thread on his sleeve. "Usually, we go in a big group. You, me, Malcolm, the rest of the team. But I was wondering if maybe this time... you wanted to go with just me?"
The air in the alcove suddenly felt very thin. YN set her mug down carefully, terrified she might drop it. "Just you? Like... a study session?"
Cedric laughed, a nervous, breathy sound. "No, YNN. Not a study session. No books allowed. Just us. Butterbeer, Honeydukes, maybe a walk up to the Shrieking Shack if the weather holds."
"Oh," she breathed. "Like a date?"
She hadn't meant to say the word so bluntly, but subtlety had never been YN’s strong suit when she was flustered.
Cedric’s cheeks turned a faint shade of pink, endearing him to her even more. "Yeah. If you’d like that. Like a date."
A smile broke across YN’s face, one she couldn't suppress if she tried. "I would like that, Cedric. I’d like that a lot."
The relief on his face was instantaneous. "Brilliant. Okay. Great." He stood up, looking happier than she’d seen him after winning the Quidditch Cup. "I’ll, uh, let you get back to Snape’s fluid dynamics. Pick you up at ten on Saturday?"
"Ten," she confirmed.
As he walked away to rejoin his friends, YN saw him do a subtle, triumphant fist pump. She looked back out the window at the swaying dandelions. Suddenly, the Potions essay didn't seem nearly as impossible.
Saturday morning arrived with a crisp bite in the air, the kind of weather that demanded thick wool scarves and sturdy boots. The sky was a piercing, cloudless blue, contrasting sharply with the amber and russet leaves clinging to the trees surrounding the castle.
YN stood by the portrait hole in the Hufflepuff common room, adjusting her scarf for the tenth time. She had opted for a fitted jumper in forest green and her favorite denim trousers, trying to strike the balance between 'effortless' and 'I spent an hour on my hair.'
"You look nice," a voice said.
She turned to see Cedric descending the boys' dormitory stairs. He wore a heavy beige coat with the collar turned up and a scarf in Hufflepuff yellow and black loosely draped around his neck. He looked devastatingly handsome, fresh-faced and bright-eyed.
"You don't look so bad yourself, Diggory," she smiled, feeling the butterflies in her stomach start a riot.
"Ready to go?" He offered his arm. It was a gentlemanly gesture, old-fashioned, but it fit him perfectly.
YN looped her arm through his. "Lead the way."
The walk down to the village was filled with the easy banter that had always defined their friendship, yet there was a new current running underneath it. Every time their shoulders bumped, or he guided her around a puddle, the electric awareness was palpable. They talked about Quidditch tactics for the upcoming season, speculated on the new Defense Against the Dark Arts curriculum, and laughed at the antics of a group of second years trying to levitate snowballs (despite there being no snow yet).
When they reached the village, Hogsmeade was bustling. The smell of frying sausages, pine, and magical sweets filled the air.
"Where to first?" Cedric asked, looking down at her. The height difference meant she had to tilt her head back, a vantage point she certainly didn't mind.
"Scrivenshaft's?" she suggested. "I need new ink."
"I said no studying," Cedric teased, though he steered her toward the stationery shop anyway.
"It's not studying, it's supply management. Besides, I love the smell of parchment."
They spent twenty minutes in the shop. Cedric patiently waited while she tested six different shades of color-changing ink, offering his opinion on which one best matched her handwriting. He ended up buying her a peacock-feather quill when she wasn't looking, slipping it into his pocket with a smirk.
Next was Honeydukes. The shop was packed to the rafters with students, a chaotic sea of black robes and colourful wrappers. The air was thick with the scent of caramel and chocolate.
"Pepper Imps?" Cedric held up a jar, his eyebrows raised.
"Only if you want me to breathe smoke in your face for the rest of the day," YN laughed. "I'm a Chocoball girl. You know this."
"Right, right. Strawberry and cream filling." He reached past a third-year to grab a bag. "I’ll get these. You get the Fizzing Whizzbees."
They navigated the crowd, their bodies pressed close together to avoid being separated. Cedric’s hand found the small of her back, a protective and gentle weight that sent shivers up her spine unrelated to the cold outside.
After escaping the sugar-fueled madness of Honeydukes, they found themselves standing on the main street. The wind had picked up, biting at their cheeks.
"Three Broomsticks?" Cedric suggested. "I think I need to defrost."
"Desperately," YN agreed.
The pub was warm, noisy, and welcoming. Madam Rosmerta was shouting orders over the din, and the fireplace roared with green flames. They managed to find a small, secluded booth in the back, away from the main thoroughfare of students.
Cedric went to the bar and returned with two frothy mugs of Butterbeer. He slid into the booth opposite her, shedding his heavy coat.
"Here's to," Cedric raised his glass, pausing as he looked for the right words. "To... finally getting this right."
YN clinked her glass against his. "To finally getting this right."
They drank, the warm, buttery liquid soothing the chill in their bones. Cedric wiped a bit of foam from his upper lip, grinning.
"So," he started, tracing the wood grain of the table with his finger. "I have a confession."
"Oh no. You’re actually a vampire?"
He chuckled. "No. Nothing that dramatic. I just... I’ve wanted to ask you out since fourth year."
YN nearly choked on her drink. She set the mug down hard. "Fourth year? Cedric, that was two years ago. Why didn't you?"
"I don't know," he admitted, looking sheepish. "I guess I didn't want to mess up the friendship. You’re... you’re important to me, YNN. We’ve always been on the same wavelength. I was terrified that if I made a move and you didn't feel the same way, things would get awkward in the common room. I couldn't risk losing my best friend."
YN reached across the table, covering his hand with hers. His skin was warm, his fingers strong. "You big idiot," she said softly. "I spent all of fourth year waiting for you to ask me sit with you at the end-of-term feast. I eventually just assumed you only saw me as 'one of the guys' because I play Chaser."
Cedric turned his hand over, interlacing his fingers with hers. The gesture was intimate, solidifying the shift in their dynamic. "I have never, not once, seen you as one of the guys. You’re YN. You’re brilliant, you’re funny, and you fly like you were born in the air. It’s intimidating, actually."
"You? Intimidated? Mr. Perfect Prefect?"
"It’s a façade," he whispered conspiratorially, leaning in. "Inside, I’m just panic and hope."
YN squeezed his hand. "Well, for the record, I’m really glad you asked me today. And I’m really glad we’re here."
"Me too."
They sat there for a long time, nursing their drinks as the afternoon light outside began to fade into a dusky purple. They talked about everything and nothing—their families, their hopes for after Hogwarts, the weird dream Cedric had about a giant badger playing the bagpipes. It was the same conversation they would have had in the common room, but the context had changed. The barrier was down.
"Hungry?" Cedric asked eventually.
"Starving."
"Let’s head back up to the castle for the feast. But... can we take the long way?"
"The one past the Shrieking Shack?"
"Yeah. Better view of the sunset."
They left the warmth of the pub, stepping back into the twilight. The temperature had dropped, and a few stray snowflakes were beginning to drift down from the darkening sky.
Instead of linking arms this time, Cedric simply took her hand. It felt natural, as if they had been doing it for years.
They walked up the hill toward the outskirts of the village. The Shrieking Shack stood looming and silent, but they ignored its eerie reputation, focusing instead on the horizon. The sun was dipping below the mountains, painting the sky in strokes of violet, bruised orange, and deep indigo.
They stopped at a vantage point overlooking the valley, the castle lights twinkling in the distance like fallen stars.
"It’s beautiful," YN whispered, her breath clouding in the air.
"Yeah," Cedric said.
When she turned to look at him, he wasn't looking at the sunset. He was looking at her. The expression on his face was open, raw, and full of affection.
"YNN," he said, his voice dropping an octave.
"Yeah?"
He stepped closer, closing the small gap between them. He reached up, his gloved hand gently brushing a snowflake from her hair. He let his hand linger there, cupping her cheek. His thumb stroked her skin, sending a jolt of heat through her that defied the winter chill.
"Can I kiss you?" he asked.
It was so typically Cedric—polite, considerate, giving her the choice even when the answer was written all over her face.
"If you don't," YN whispered, her heart hammering against her ribs, "I’m going to hex you."
Cedric smiled, a slow, dazzling thing that made her knees weak. He leaned down, tilting his head.
When his lips met hers, it wasn't an explosion of fireworks. It was something better. It was coming home. It was soft and warm, tasting faintly of butterbeer and promise. It was the culmination of two years of stolen glances and shared jokes, of studying by the fire and flying in the rain.
YN closed her eyes, melting into him. She reached up, gripping the lapels of his coat to pull him closer. Cedric’s arm wrapped around her waist, holding her steady, pulling her flush against him as if he never wanted to let go.
They broke apart slowly, breathless, foreheads resting against each other.
"Wow," Cedric breathed, his eyes still closed.
"Yeah," YN managed, her voice trembling slightly. "Wow."
He opened his eyes, and the grey was bright and clear. "Worth the wait?"
"Definitely," she laughed breathlessly. "Though let’s not wait another two years for the next one."
"Deal." He kissed her quickly on the nose, then straightened up, interlacing their fingers again. "Come on. If we’re late for the feast, the Fat Friar will eat all the treacle tart."
They began the walk back to the castle, the snow falling a little heavier now, dusting their shoulders in white.
The weeks that followed were a blur of happiness. It was the kind of happiness that was quiet and constant, a background radiation that made even the dreariest Monday morning Herbology double-period seem bearable.
They didn't make a big announcement. They didn't have to. It was in the way Cedric saved her a seat at the Hufflepuff table every morning. It was in the way YN wore his Quidditch jersey to practice instead of her own, the fabric swallowing her frame. It was in the way they studied in the library, their feet tangled together under the table.
One evening in mid-November, the Hufflepuff common room was particularly rowdy. The team had won a match against Ravenclaw that afternoon—YN had scored four goals, and Cedric had caught the Snitch in record time. The party was in full swing.
YN was sitting by the fire, laughing as Malcolm reenacted a particularly spectacular bludger hit. She felt a tap on her shoulder.
"Hey, star player," Cedric whispered in her ear.
She turned, grinning. "Hey yourself, Captain."
"It’s getting a bit loud in here. Want to escape?"
"Where to?"
"Astronomy Tower? It’s clear tonight."
They snuck out through the barrel hole, giggling like first years avoiding Filch. The castle was quiet at night, the stone corridors lit by flickering torches. They climbed the spiraling stairs to the highest point of the castle.
The air up there was freezing, but the view was unparalleled. The stars were scattered across the black velvet sky like diamond dust.
They stood at the railing, shoulder to shoulder, looking out over the Forbidden Forest and the Black Lake, which reflected the moonlight like a dark mirror.
Cedric wrapped his arms around her from behind, resting his chin on top of her head. YN leaned back into his warmth, crossing her arms over his.
"It’s a good year," Cedric murmured.
"The best," YN agreed.
"I’m glad we’re doing this. You and me."
"Me too." She turned in his arms to face him. The moonlight washed him in silver, highlighting the sharp line of his jaw and the softness of his eyes.
"You know," Cedric said, looking down at her. "My dad keeps asking about you."
YN raised an eyebrow. "What have you been telling him?"
"Just the truth," Cedric shrugged. "That I’m dating the smartest, prettiest, and most talented witch in the school. He wants to meet you properly over the holidays."
YN felt a flush of pleasure. "I’d like that. As long as he doesn't bring up that time I fell off my broom in second year."
"No promises. He loves that story."
They stood in silence for a moment, just listening to the wind whistling through the turrets. It felt suspended in time, this moment. No exams, no pressure, no expectations other than just being there for each other.
"YNN?"
"Mmhmm?"
"I think I’m falling in love with you."
The words hung in the cold air, crystal clear. YN stopped breathing for a second. She looked up at him, searching for any sign of hesitation, but found only sincerity.
Her heart swelled, filling her chest until she thought it might burst. It wasn't scary. It was the easiest thing in the world.
"I think," she whispered, reaching up to touch his face, "that I’m already there, Cedric."
He smiled, that same brilliant smile that had started it all in the common room weeks ago. He leaned down and kissed her, and under the vast, starry sky of Hogwarts, everything was perfect.
There were no dark clouds on the horizon tonight. No ominous signs. Just a boy, a girl, and the infinite promise of a future that belonged entirely to them.
"Come on," Cedric said softly, breaking the kiss but keeping her close. "Let’s go back inside. I think I hid a stash of pumpkin pasties in my trunk."
"You are a scholar and a gentleman, Diggory."
"I try."
Hand in hand, they descended the stairs, leaving the cold night behind for the warmth and light of the castle, ready to face whatever came next, as long as they did it together.












