The corridors of Hogwarts blurred into a watercolor of torchlight and shadow as Fred sprinted, robes flapping like raven wings. His heart hammered louder than his footsteps. Where is she? Every archway, every suit of armor, every whispering portrait mocked him with her absence. He skidded around a corner and nearly collided with Hermione, radiant in periwinkle, Viktor Krum's hand at her waist.
"Herm! Have you seen Ary?" The words tumbled out in a frantic rush. "I need to find her. I messed up, big time, but I finally know how I feel."
Hermione's brow creased. "I lost her the moment the Weird Sisters struck their first chord. She vanished into the crowd."
Fred was already moving. "Thanks, Hermione, really helpful," he muttered, sarcasm masking panic. He had to find her. Had to fix this.

Arya's heels clicked against stone as she fled the Great Hall, the music fading into a muffled heartbeat. Tears stung, but she blinked them back. Not here. Not in front of everyone. She needed air, silence, anything to drown the image of Fred's lips on Angelina's.
She turned a corner and stopped.
Fred stood ten meters away, chest heaving, hair wild from running. Moonlight spilled through a high window, gilding the red in his hair, the worry in his eyes. The space between them crackled.
"Fred," she breathed.
He crossed it in three strides. "You look..." His voice cracked. "You look beautiful, Arya."
Heat flooded her cheeks. She stared at her shoes, the deep red silk pooling like spilled wine.
Fred took her hands, warm, calloused from Quidditch, trembling. She lifted her gaze. His eyes, usually sparkling with mischief, were storm-dark with sincerity.
"I've been looking everywhere," he whispered. "I need to tell you something."
"I'm listening."
He leaned in, forehead almost touching hers. "I'm sorry. For being a playboy. For hurting you. It took kissing someone else to realize—" His voice broke. "—I only want you."
Her heart stuttered. "But you said... you weren't looking for a relationship. That you couldn't give me what I need."
"I know what I said." His thumbs brushed her knuckles. "But these weeks without you? Seeing you with George? It gutted me. I don't want freedom if it means losing you. I want you, darling. Every laugh, every fight, every sunrise. I'll give you everything, promise. Just... give me another chance?"
Arya's breath hitched. "Seeing you with Angelina—"
"—was a mistake I'll regret forever." He cupped her face. "I've had my eye on someone special for years. Someone who knows every prank I've ever pulled, every fear I've never said aloud. Someone who makes my heart race just by smiling." His voice dropped to a reverent hush. "That someone is you."
"Are you sure?" She squeezed his hands, anchoring herself.
"Darling, I don't love her, or anyone, the way I love you. She was a flicker. You're my fire." He brushed his lips to hers, feather-light, tasting of apology and starlight. "I'm sorry I made you wait. My heart's been yours all along."
Arya pulled back just enough to whisper against his mouth. "You're the only one I've ever wanted. We'll learn together how to be us. But promise you won't hurt me again?"
Fred threaded fingers through her curls. "I swear on every Weasley prank, I'll never hurt you. I'll spend every day proving our love comes first." He stole another kiss, deeper this time, sealing the vow.
Then a mischievous glint sparked. "End the night somewhere special?"
She smiled, eyes shining. "Lead the way."

The Astronomy Tower was a cathedral of night. Stars spilled across the velvet sky like scattered diamonds; snowflakes drifted lazily from the enchanted ceiling below. Fred conjured a soft woolen blanket with a flick of his wand, wrapping it around them both as he pulled her close.
The faint strains of the Weird Sisters floated up "Do the Hippogriff" slowed to a waltz. Fred swayed her gently, one hand at her waist, the other cradling her head to his chest. Her ear pressed to his heartbeat, steady, strong, hers.
"I still can't believe you fell for me," she murmured, smiling against his shirt.
He kissed her forehead. "Love turns cynics into believers, darling. And I'm so glad to make you happy." Another kiss, lingering. "I'll never let you down."
She cupped his face. "I trust you, Freddie."
With a playful grin, he flicked his wand. Mistletoe bloomed above them, glowing silver. "I promise to make you laugh every day, love you with every fragment of my soul. And one day" His voice softened "when the time's right, I'll kneel under these same stars and ask you to be mine forever. Nothing would make me happier."
Arya rose on tiptoes, kissing him beneath the mistletoe. "Merry Christmas, Freddie. Your love is the greatest gift I've ever unwrapped."

...

Months melted into years.
They rebuilt from scratch, stolen picnics by the Black Lake, midnight broomstick rides over the Forbidden Forest, Fred charming fireworks to spell "Arya <3" across the sky. At the end of her sixth year, beneath the Whomping Willow's gentle sway, he asked her to be his girlfriend with a daisy chain crown and a kiss that tasted like forever.
He kept every promise. Bouquets of lavender and sunflowers appeared on her dormitory pillow "just because." He stole kisses in empty classrooms, making her blush crimson. Their dates were adventures, dragon-shaped clouds, secret passages, laughter echoing through stone halls. Arya watched him bloom into the man she'd always seen: fiercely loyal, endlessly devoted, hers.

But soon the world darkened.
Voldemort's shadow lengthened. The Burrow brimmed with fear the night Fred and Arya turned twenty and eighteen. Death Eaters loomed; war drums beat.
Fred stepped forward, shielding her with his body. "She's my soulmate. I won't leave her." His voice rang with steel. "I'll fight for her, for our future. She's my everything. I'll come back to her, no matter what."

The war came.
In the frigid hush before battle, Fred found her in the Room of Requirement. Moonlight silvered the tears on his cheeks. He knelt, producing two simple gold bands from his pocket, etched with tiny stars.
"I confirm what I asked you in your sixth year," he said, voice trembling but sure. "I know who I want, you, darling. Forever." He slid the ring onto her finger. "I'll love and protect you always, my wife."
Arya's hands shook as she slipped its mate onto his. "I'll stand by you, cheer you, love you till the stars burn out." She wiped his tear. "Together."
He pulled her into a crushing embrace. "I love you more than words, Arya. Whatever comes, we face it together." Their kiss was fierce, a vow against the dark.

Fate was cruel.
Fred fought with blazing courage, but a curse found him in the chaos. He fell, Arya's name on his lips.
She refused to let him go alone. The brightest witch of her age roared into battle, wand a comet, avenging the boy who'd given her his heart. She fought until her strength gave out, until she joined him beyond the veil.

In another world...
Two souls found each other beneath an endless sky of stars. Fred opened his arms; Arya ran into them. No war, no pain, only the rhythm of twin heartbeats, the hush of eternal night.
He kissed her forehead. "Told you I'd never let you down."
She smiled with her fingers laced with his. "And I promised to love you till the end of days."
Hand in hand, they danced beneath forever's mistletoe, laughing, loving, home.

The end.

A.N. Don't hate me, I just followed what J.K.R. wrote. In alternative, Fred doesn't die, they end the war and decided to marry in front of their families and friends too, they had their own house, Arya was an alchemist as she dreamed and Fred was working at the prank's shop with his brother. They lived forever happily ever after. You can choose if they had kids or not.