We Shouldn't Be Doing This, Step-Brother

Sienna

"Jaxon, stop.." My voice cracked, half-whisper, half-plea.

My back slammed against the cold garage wall, his chest crushing into me, his scent drowning out the grease and motor oil.

"We shouldn't be doing this," I breathed, fists pressing to his chest, trembling.

"Why not?" His voice was low, rough, vibrating through me. His hands cupped my face, thumbs brushing my cheeks like he owned them.

"You know why." I swallowed hard. "The house. The rules. Them."

"Fuck the rules." His smirk was dark, dangerous.

"It's not just rules. This... us..." My nails curled into his shirt. "It's wrong."

"Is it?" His forehead touched mine, breath hot on my lips. "Because it feels like I've been waiting my whole life to be this close to you, Sienna."

My chest squeezed. "You're an idiot." I blushed.

"Maybe." His mouth twisted into a daring smile. "But so are you for pretending you don't feel this."

I opened my mouth, but his lips crashed into mine before I could answer.

It wasn't soft. It wasn't patient. It was war. His groan vibrated into me as my fists fisted his shirt and yanked him closer.

"Don't," I mumbled into his mouth.

"Don't what? Don't stop?" he growled.

I shut my eyes. I couldn't say it.

"Say it," he whispered against my jaw. "Say you don't want this, and I'll stop."

"I... can't." My voice shook. "I want everything."

That broke him. His hands ripped at my shirt, tugging it up, exposing skin to cold air and his burning touch. I gasped as his calloused palms molded over my body.

"Beautiful," he murmured, eyes dragging over me with raw hunger.

"Jaxon..." My warning was thin, weak, swallowed by his mouth on my throat, kissing, biting, making my knees buckle.

"What if they come home?" My voice cracked as my zipper slid down.

"They won't," he growled, shoving my jeans down. "And even if they do..." His lips pressed to my collarbone. "I'm not stopping."

Heat shot through me as his shirt hit the floor. My fingers traced the cut of his chest, trembling.

"I've wanted you since day one," he said, lifting me in one motion. My legs locked around his waist, his hard dick grinding against me through thin layers.

"Jaxon..."

"I want you, Sienna. Say you're mine."

"I..." My head fell back as his mouth swallowed my protest. His fingers slid under my panties into my already wet pussy, stroking, circling until my hips jerked.

"Say it," he demanded.

"I'm yours," I gasped.

That was all it took.

He inserted his dick inside me, stroking slowly at first, then he increased the pace carefully.

I moaned  as I held him close until my nails dug into his back.

"Fuck...Sienna." My name on his lips was a curse, a prayer, everything.

"Jaxon," I moaned, legs tightening around him, body arching to meet every thrust.

The rhythm built harder and faster, years of wanting boiling over. His hand pressed to my clit, sending shockwaves through me until I couldn't breathe.

"This is wrong," I whimpered.

"This is us," he groaned, pounding deeper. "And I'm never letting go."

The world disappeared. No house. No rules. Just his body slamming into mine, our mouths desperate, breaths ragged, hearts breaking and beating as one.

When release hit, it shattered me. My cry filled the garage, nails carving his skin. His groan tore out raw, arms locking around me as he buried himself deep.

And then...silence.

Our breathing. The hum of the bulb. My forehead against his shoulder, his chest heaving under my hands.

Then....

The rattle of an engine.

I froze. "Jaxon."

Headlights swept across the window. A car door slammed. Another. Heavy footsteps crunched the driveway.

"Oh my god," I breathed, panic seizing me. "They're home."

We were still tangled, half-naked, sweat-slicked, forbidden heat dripping off us. One second too slow from being caught.