Leo (StepBrother)

The family SUV hummed along the highway, packed tight with luggage, parents, and younger siblings. Every seat was claimed except for one unfortunate spot: your stepbrother’s lap. “

Looks like you’re riding with me the whole trip, sis,”

He murmured with that smug, predatory grin only you could see.

His voice was low enough to blend with the road noise and the music playing up front.

You hesitated, but with Mom shooting you a “just sit down” look in the rearview mirror, you had no choice.

You lowered yourself onto his thighs, trying to keep some space between you.

He wasn’t having it.

Strong hands gripped your hips under the oversized blanket Mom had tossed back for “comfort.”

He pulled you flush against him, and you immediately felt the thick, hard outline of his cock straining against his sweatpants.

While Dad talked about the next rest stop, your stepbrother subtly tugged your shorts and panties aside.

“Shhh,” he breathed hot against your ear, nuzzling into your neck like an affectionate brother.

“Just relax. No one will know.”

You bit your lip hard as the fat head of his cock nudged between your folds.

He was already leaking precum, making the slide easier as he rocked his hips upward in tiny, careful movements.

Inch by inch, he sank into your tight heat until you were fully seated on his lap with every inch buried inside you.

The car hit a bump and you had to stifle a gasp as it drove him even deeper.

For the first few miles he stayed mostly still, just throbbing inside you, occasionally grinding up in slow circles while pretending to scroll on his phone.

But the longer he stayed sheathed in your wet pussy, the harder it got for him to control himself.

His breathing grew heavier against your shoulder.

“Fuck… you’re squeezing me so good,” he whispered.

One arm wrapped around your waist under the blanket while the other held your thigh.

His thrusts became more deliberate shallow, sneaky pumps that made wet little sounds barely masked by the engine.

Your parents chatted obliviously in the front seats.

He started rutting faster, hips snapping up harder, chasing friction.

You felt the base of his cock beginning to swell, that thick knot pushing against your entrance with every thrust.

“Gonna knot you right here,” he growled quietly, teeth grazing your earlobe.

“Gonna lock my cock inside my little stepsister while Mom and Dad are sitting three feet away.”

You tried to stay quiet, but a tiny whimper slipped out when the knot finally caught.

He forced it in with one firm upward thrust, the thick bulb popping past your entrance and inflating rapidly, stretching you wide.

The sudden pressure made your walls clamp down hard around him.

He groaned low in his throat, burying his face in your hair to hide it as his knot swelled even bigger, sealing you together.

Now you were truly stuck impaled on your stepbrother’s throbbing knot while the car kept driving down the highway.

Every small bump or shift in the road tugged on that swollen knot, sending jolts of overwhelming pleasure through both of you.

He kept making tiny, instinctive little thrusts, unable to pull out even if he wanted to.

“Shit… feel that? You’re mine now,” he panted softly, one hand sneaking under your shirt to pinch a nipple.

“Gonna flood your pussy with so much cum it’ll be dripping down my balls by the time we reach the hotel. And you’re just gonna have to sit here and take every drop like a good girl.”

His knot pulsed hard inside you as he finally came, pumping thick, hot ropes of cum deep into your womb while the rest of the family remained completely unaware.

The pressure of the knot kept every drop trapped inside you, ensuring you’d stay marked and full for the rest of the long ride.

He kissed the side of your neck sweetly, like a loving big brother, and whispered

“Better get comfortable, sis. We still have four more hours… and this knot isn’t going down anytime soon.”