Mattheo Riddle - Imagines/OneShot

The Boy is Mine

Song Inspo: The Boy is Mine—Brandy & Monica

Word Count: 685

The Slytherin common room buzzed with its usual mix of chatter and low-lit mystery. Y/N sat curled up on a couch near the fireplace, flipping lazily through a Potions textbook, though her eyes frequently flicked up to where Mattheo was standing by the windows. He was talking with a few of his friends, hands in pockets, his dark curls messy but in that annoyingly perfect way. As usual, he looked like he didn't have a care in the world, a smirk tugging at the corner of his lips.

What did catch Y/N's attention, though, was the girl standing far too close to him.

Clarissa Sterling, a fellow Slytherin with a reputation for being relentless when it came to boys, had her eyes locked on Mattheo. She laughed too loudly at something he said, twirling a strand of her long blonde hair around her finger as she leaned in, brushing her shoulder against his arm.

Y/N's eyes narrowed. She knew Mattheo wouldn't start anything—he wasn't the type to stray. But that didn't mean Clarissa wasn't about to try her hardest.

"Mattheo, you're so funny," Clarissa purred, batting her eyelashes in a way that made Y/N's stomach churn. "You know, I've been meaning to ask you—maybe we could study together sometime? I could really use some help...especially with Defense Against the Dark Arts."

Mattheo glanced at her, eyebrows raised in amusement, clearly not taking her seriously. "I don't think I'm much of a tutor, Clarissa."

"Oh, I don't mind," she cooed, stepping even closer, her hand lightly grazing his arm. "We'd have fun, don't you think?"

Before Mattheo could respond, Y/N stood up, her eyes fixed on Clarissa. She casually walked over, but there was nothing casual about the look on her face.

"Clarissa," Y/N said, voice calm but with a sharp edge. "Back off."

Clarissa blinked, her hand still lingering on Mattheo's sleeve. "Oh? Why? We're just talking." She gave a sweet smile, but there was a hint of challenge in her eyes. "Besides, what's it to you?"

Y/N took a step closer, crossing her arms. "Because he's my boyfriend."

Clarissa's smile turned condescending. "Oh, really? I hadn't heard that. Are you sure you're not just imagining things? Mattheo doesn't seem like the type to settle down. Maybe you're reading too much into it."

Mattheo opened his mouth to speak, but before he could say anything, Y/N had already moved.

Without opening his mouth to speak, but before he could say anything, Y/N had already moved.

Without a word, she reached up, grabbed him by the collar of his shirt, and pulled him down toward her. In one swift motion, her lips crashed against his in a kiss that was equal parts fiery and possessive. Mattheo's surprise lasted only for a second before he kissed her back, his hands instinctively finding her waist, pulling her close.

When they finally pulled apart, both of them slightly breathless, Y/N turned back to Clarissa, a smug smile on her lips.

"This boy," she said, her voice low and confident, "is mine."

Clarissa's mouth hung open, clearly caught off guard. For a moment, she looked like she might say something, but the fire in Y/N's eyes made her think better of it. She quickly plastered on an awkward smile, stepping back.

"Well...I guess I'll leave you two then," she muttered, her voice faltering. She turned on her heel, practically fleeing toward the other side of the room.

Y/N let out a small laugh as she watched her go. "Some people just don't know when to quit, do they?"

Mattheo chuckled, still holding her close. "Not gonna lie, that was kinda hot."

Y/N rolled her eyes, though she couldn't hide the grin tugging at her lips. "I wasn't going to let her just flirt with you like that."

"Didn't think you had it in you," he teased, pulling her closer. "You've got quite the possessive side."

"Only when it comes to you," she replied, leaning in to kiss him again, softer this time.

As they pulled apart, she smirked, glancing at the other side of the room where Clarissa had retreated. "I think she got the message."

Mattheo grinned, his eyes glinting with amusement. "Loud and clear."

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