My Brother's Best Friend's One-Night Rule

Logan

The crisp contract paper felt heavier than it should. I stared at the signature at the bottom. Avery Sinclair.

Her handwriting was all neat loops and careful lines, so different from the frantic, gasping woman in the alley who’d tasted of defiance and tears.

She was mine now.

The thought was a dark, possessive rumble in my chest. For eight hours a day, at least. An employee. A subordinate. A gilded cage of my own making, right next to my office.

I tossed the pen onto the polished mahogany. It rolled, clattering to a stop against a framed deal trophy. The morning sun streamed into my corner office at Titan, painting everything in a sharp, guiltless light. It didn’t touch the cold knot in my gut.

Transferring Mark to the Omaha satellite office this morning was a dirty, ruthless move. A blatant abuse of power. I’d dictated the email myself, my voice cold as I told the HR director to make it happen “for strategic synergy.” Bullshit.

It was pure, unadulterated jealousy. A green-eyed monster I hadn’t known I housed until I saw him across that bistro.

The memory flashed, visceral and sharp: Avery in that green dress, leaning toward him. Her smile, forced but there. His hand, briefly touching her arm. A casual, innocent gesture that had sent a bolt of pure rage straight through my spine. In that moment, I hadn’t seen a competent mid-level manager. I’d seen a man coveting what was mine. Smiling like he had a right to her time, her attention, her laugh.

No one else was allowed to touch her.

The thought wasn’t rational. It was primal. A bedrock truth that had shifted everything. If I had to, I’d fire every man in this building who dared to look at her with anything more than professional respect. I’d buy the damn bistro and tear it down. I’d ruin anyone who got close.

I leaned back in my leather chair, the expensive material groaning. I exhaled a harsh breath, running a hand over my stubbled jaw.

She thought I was a cold-hearted bastard. A jerk playing games with his best friend’s little sister. She had no idea.

She had no idea I’d been obsessed with her for four damn years.

It wasn’t the woman she’d become that had snared me. Not the sleek dresses, the confident smiles, the way she’d learned to wield her own quiet power. It was the girl she’d been. The ghost in the memory that played behind my eyes whenever I let my guard down.

Four years ago. Ethan’s house.

The bass from the party downstairs was a dull throb through the floor. I’d escaped, needing a minute of quiet, a break from the noise. I’d found myself outside her bedroom door. A sanctuary of silence in the chaotic house.

A soft knock. No answer.

I’d pushed the door open anyway.

She was curled in a giant armchair, swallowed by an oversized university hoodie, her knees drawn up to her chin. Glasses slid down her nose. A fortress of philosophy and political theory textbooks surrounded her. The lamplight caught the gold in her brown hair, turning it to a soft halo. She looked up, startled, a rabbit caught in headlights.

“Why,” I’d asked, my voice lowering to match the hush of the room, “is such a beautiful girl hiding up here instead of having fun with the rest of us?”

Her eyes—wide, intelligent, deep—had gone impossibly round. Her heart seemed to stop. I saw it in the frozen stillness of her. I hadn’t meant it as a line. It was just… the truth. In that cocoon of quiet, away from the performance of the party, she was stunning. Not in a conventional way. In a real way. A soul-deep way.

I’d walked in, picked up a dense-looking book from her desk. “Heavy reading.” My gaze lifted, locked with hers. For a second, the world outside that room ceased to exist. I wasn’t Ethan’s friend. She wasn’t his kid sister. We were just two people in a pool of quiet light. I saw the sharp mind behind the shyness. The wit hiding in the silence. The woman waiting inside the girl.

That single look was the catalyst. The first crack in my foundation.

And then Ethan’s voice, from a later night, a solemn promise extracted over whiskey: “My sister is off-limits, Logan. You ruin every woman you touch. You love the chase, then you get bored. You leave wreckage. Don’t ever bring that toxic shit near her. Swear it to me.”

His eyes had been dead serious. He knew my history. The string of short, intense flings that always ended because I couldn’t… wouldn’t… let anyone in. Emotional ties were complications. Complications threatened the few real things in my life—like my friendship with Ethan.

I’d sworn it. A blood-oath between brothers.

So I built a wall. A fortress of indifference. I treated her like a kid sister. I shoved down every instinct that fired when she walked into a room. When she started changing, trading hoodies for dresses that hinted at the curves beneath, I made myself look away. I thought my coldness was a shield. For her. For him. For the part of me that knew he was right—I’d only ruin her.

The night of the gala broke me. Seeing her on that terrace, a vision in midnight blue, the city lights catching the determined set of her jaw… the wall crumbled into dust. I kissed her. I gave her the keycard. I crossed the line I’d sworn I’d never approach.

And then, in the hotel room, with her warm and willing beneath me, whispering about a “next time”… Ethan’s voice had echoed like a gunshot in my head. The shame had been instant, corrosive. I’d pushed her away. I’d thrown up my stupid, cruel rules to rebuild the wall twice as high.

But the alley… God, the alley.

Tasting her anger. Feeling her tears on my thumbs. Seeing the challenge in her eyes—break your rules or let me go. The last of my resolve had shattered. I was a selfish jerk. Exactly what she’d called me. Because if I couldn’t have her in the light, in the right way, I’d find another way. A darker way. A way that kept her close but under my control.

The intercom on my desk buzzed, jerking me from the memory. Eleanor’s crisp, efficient voice filled the room. “Mr. Thorne? Your new Executive Assistant is here for her onboarding.”

My pulse, already erratic, gave a hard, single thump.

I looked at the contract. At her name. My thumb traced the ‘A’.

“Send her in,” I said, my voice thankfully steady.

The door clicked open.