But the universe has a sick sense of humor.

Because five hours into the road trip with my hot stepbrother, I’ve already watched him eat gas station nachos like a starving raccoon, belt out eighties power ballads with alarming enthusiasm, and somehow make a wrinkled white t-shirt look like couture.

And I can’t stop staring.

The Unwanted Passenger My parents remarried three years ago, which meant I gained a stepbrother with green eyes, a lazy smile, and an infuriating habit of calling me “kiddo.” We’ve spent every family holiday since then politely ignoring each other. He’s a musician. I’m a pre-med student. Our worlds don’t intersect.

Until his car broke down the day before his cross-country move.

“Come on, Mia. It’s just two weeks. Think of it as an adventure.”

His dimples should be illegal. So should the way he said my name—soft, coaxing, like he knew exactly what it did to my ribcage.

I said yes. Obviously. I’m only human.

Somewhere in Nevada By day three, the car feels too small. Caleb’s arm rests on the center console, his fingers inches from mine. The radio plays something slow. The desert sunsets are too beautiful. Everything is too much.

We stop at a motel with flickering neon lights and only one room left.

“I’ll take the floor,” he says, grabbing a pillow.

But at 2 AM, I wake up to find him beside me—asleep, yes, but close. So close I can count his eyelashes. So close I can feel the warmth radiating off his skin.

I should move. I don’t.

The Line We Cross It happens in a diner parking lot in Colorado. A stupid argument about the playlist turns into something else. His hand on my wrist. My breath catching. His eyes dropping to my lips.

“Tell me to stop,” he whispers.

I don’t.

The kiss is nothing like I imagined. It’s better. Hotter. Terrifying in how right it feels. His hand slides into my hair. My fingers grip his stupidly perfect jaw. The world shrinks to just him—his taste, his scent, the little sound he makes when I pull him closer.

“Mia,” he breathes against my mouth. “What are we doing?”

I don’t have an answer. I only know I don’t want to stop.

Two Weeks That Change Everything The rest of the road trip with my hot stepbrother becomes a blur of stolen moments and whispered confessions. A sunrise in Utah where he holds my hand and doesn’t let go. A thunderstorm in Kansas where we end up tangled together in the back seat. A night in Chicago where he plays me a song he wrote—about a girl he didn’t expect to fall for.

“You’re not just my step-sister,” he says, strumming his guitar. “You’re everything.”

I want to be logical. I want to think about our parents, about the future, about all the reasons this is a terrible idea.

But when he looks at me like that, logic burns away.

The Destination We Didn’t Plan New York arrives too fast. His new apartment is small and empty, waiting for him to fill it with music and memories. I’m supposed to turn around and drive back alone.

Instead, I unpack my bag.

“What are you doing?” he asks, watching me hang my jacket in his closet.

“Changing my flight.”

His smile is blinding. He crosses the room in two strides and kisses me again—deep, certain, like he’s claiming something he’s wanted for years.

“Best road trip ever,” he murmurs against my lips.

I laugh. “Best detour ever.”

Road Trip with My Hot Stepbrother isn’t just a story about forbidden attraction. It’s about taking the wrong turn and finding exactly where you belong. Because sometimes the person you least expect is the only one who feels like home.