The Brother's Best Friend Rule

Episode 5: Red Cups and Radar

The bass was a physical entity inside the off-campus house, thumping so violently against the floorboards that Aria could feel it vibrating right through the soles of her platform boots.

It was the second weekend of the fall semester, and the annual "Welcome Back" party hosted by Leo and Ethan’s senior crowd was in full swing. The air was thick with the scent of cheap beer, heated bodies, and expensive cologne. Neon pink LED strips lined the ceiling, casting a hazy, surreal glow over the crowded living room.

Aria stood near the kitchen island, her fingers tightly gripping a red plastic cup filled with lukewarm lemonade. She felt completely out of her depth. Back in high school, a party meant sitting around a bonfire with people she had known since kindergarten. Here, everyone looked devastatingly mature, effortlessly confident, and entirely too cool.

She had spent nearly an hour getting ready in her dorm room, agonizing over her outfit before settling on a black cropped top, high-waisted denim, and a flannel shirt thrown casually over her shoulders. She wanted to look like she belonged. She wanted to look like an adult.

Specifically, she wanted him to see her as one.

"Hey, freshman! You're falling behind!"

Aria snapped out of her thoughts as her roommate, Maya, nudged her arm, raising her own drink in a silent toast. Maya had already fully adapted to college life, laughing and flirting with a couple of guys from the club soccer team.

"I'm fine, just taking it all in," Aria replied, offering a small smile. Her eyes, however, immediately went back to scanning the room.

It didn't take long to find him. Ethan was leaning against the doorframe leading out to the back patio, a casual smile playing on his lips as he talked to a group of seniors. He was wearing a plain black t-shirt that fit his broad chest perfectly, his dark hair slightly rumpled. Standing next to him was a tall, stunning blonde girl who kept laughing entirely too loudly at everything he said, her hand occasionally resting on his forearm.

A familiar, bitter knot tied itself in Aria’s stomach. Of course. He was twenty-two, a popular senior, and entirely out of her league. To him, she was probably still the kid who needed help with her algebra homework.

"Aria!"

A heavy arm suddenly dropped over her shoulders, nearly making her spill her drink. She didn't even need to look up to know it was Leo. He smelled like beer and sweat, a massive, goofy grin plastered across his face.

"Look at you, actually out of your cave! Having fun? Nobody's bothering you, right?" Leo asked, his protective big-brother radar immediately activating as his eyes scanned the guys standing near them in the kitchen.

"I'm fine, Leo. Maya is here with me," Aria laughed, gently trying to pry his heavy arm off her neck. "Go back to your friends."

"Alright, alright. But keep your phone on. If any of these guys try anything, you tell me and I’ll throw them out the window," Leo warned, only half-joking, before wandering back toward the beer pong table.

Aria sighed, taking a sip of her lemonade. She decided she needed some fresh air and started navigating her way through the dense crowd toward the front porch. But before she could reach the door, a tall guy with a backward cap stepped directly into her path, cutting her off.

"Hey. Haven't seen you around before," the guy said, leaning against the wall and giving her a slow, appreciative look. "You a freshman?"

"Yeah. Just started," Aria said, keeping her voice polite but taking a small step back.

"Nice. I'm Carter," he said, stepping closer to close the distance she had just made. He smiled, a bit too confidently. "You're pretty cute for a freshman. Want to come upstairs? A few of us are hanging out in the lounge where it's quieter. I can get you a real drink."

He reached out, his hand moving to grip her elbow to lead her toward the stairs. Aria froze, discomfort twisting her gut. She didn't want to go upstairs, but she didn't know how to reject him without making a scene. "Um, actually, I was just going to look for my brother—"

"She said she's fine, man."

The voice cut through the noise of the party like a blade. It was low, quiet, and carried a dangerous edge that Aria had never heard from him before.

Carter froze, his hand dropping from Aria’s arm as a towering figure stepped up right beside her.

Ethan stood there, his posture completely relaxed, yet there was a terrifying tension in his broad shoulders. His dark eyes were locked onto Carter, entirely devoid of the warm, easygoing expression he usually wore. He didn't look like the sweet boy next door anymore; he looked like a man protecting his territory.

Carter blinked, looking at Ethan, then at the varsity soccer jacket Ethan was casually holding in his hand. He quickly realized he was outmatched. "Oh. Hey, Vance. Didn't know she was with you."

"She's with me," Ethan stated, his voice flat and unyielding. "So back off."

Carter raised his hands in a mock surrender, stepping away. "My bad, man. No trouble." He quickly disappeared into the crowd.

The second Carter was gone, the heavy atmosphere evaporated. Ethan turned to Aria, his expression instantly shifting from fierce protection to deep concern. He placed a steady, warm hand on the small of her back, guiding her gently away from the crowded hallway and toward the quieter corner of the front porch.

The cool night air hit Aria’s face, a welcome relief from the suffocating heat inside.

"You okay?" Ethan asked, leaning against the porch railing so he was at eye level with her. His eyes scanned her face, checking for any signs of distress.

"Yeah. I'm okay," Aria breathed, her heart hammering against her ribs—though now, it had absolutely nothing to do with Carter. Ethan’s hand was still resting lightly on her waist, his thumb cutting small, subconscious circles against the fabric of her flannel shirt. It felt like liquid fire. "Thanks. He was being a little pushy."

Ethan frowned, a muscle feathering in his jaw. "If Leo saw that, he would have started a fight. You can't just wander off by yourself in a house full of drunk seniors, Ari."

Aria looked up at him, her stubborn streak flaring up. She was tired of being the one who always needed saving. "I wasn't wandering off. I can take care of myself, Ethan. I'm eighteen."

Ethan stared at her for a long, silent moment. The porch light caught the amber highlights in his dark eyes. His gaze dropped to her lips for a fraction of a second before lifting back to her eyes. The easy, older-brother mask he usually wore seemed to slip, just for a moment, revealing something raw and intense beneath it.

"Yeah," Ethan murmured, his voice dropping into a rough, low register that sent shivers straight down her spine. "I noticed."

Aria forgot how to breathe.

Ethan slowly took his hand off her waist, but he didn't step back. Instead, he unzipped his varsity jacket and draped it over her shoulders, exactly like he had done four years ago at the soccer field. Only this time, it didn't feel like a comforting older brother looking out for a kid. It felt heavy. It felt charged.

"Wear this," Ethan said softly, his eyes locking onto hers. "It lets everyone in there know you're spoken for. So no one else bothers you."

Before Aria could process the chaotic racing of her heart, Ethan offered her a small, familiar smirk, though it didn't quite reach his eyes this time. "Come on. Let's go find Leo before he drinks all the beer."

As he turned to lead her back inside, Aria clutched the lapels of his oversized jacket. The scent of him enveloped her completely. She looked at his broad back, realizing that the boundary lines hadn't just blurred tonight—they had completely caught fire.