prompt: Castle/Beckett - Hot, quick, and dirty in the backseat of her new police issued vehicle.


"What if someone sees the car rocking and -"

"Castle, shut up."

Her tongue in his mouth shuts him up as effectively as her words, and all he can do is grip her thighs tighter and grunt as she twists her hips, sinking onto him further. She moans into his mouth, her fingers fisted in his jacket, and she rocks into him, biting at his lip, clenching at him with her inner muscles, and he chokes. Fuck.

He's pretty sure this is bordering on illegal. But Scranton was a long drive, and traffic was so bad, and is it really his fault he's trapped in this car with his smoking hot girlfriend? - and he got bored, so he got a little handsy, but it was absolutely her idea to pull the car over into an empty rest stop parking lot and shove him into the backseat.

And he has no idea how she managed to contort herself to get her pants down this fast in the backseat of her car, this shiny new blue car he likes so much. But he's more than happy about it. He groans, driving his hips up into her, drawing out that long high-pitched keening noise that means she's close. She's getting off on it, on all of it, this really, really bad idea and the increasingly dangerous odds that someone will see them are so hot.

Castle grits his teeth and slips his fingers between them, drawing his thumb over just the perfect spot that gets her mewling, clawing at his back, and then one more time and she's finished, her body seizing up, tightening around him, and he grunts and spills into her, his hips jerking in release.

He has no idea how the NYPD switched her from that dull beige contraption to this lovely new machine, but he's happy with it.

"I'm convinced they meant for this to happen," he murmurs into her hair as she pants against him. "They got you a car with this much room in the backseat."

"Don't get used to it."

But she grins, and she kisses him, and even as they scramble back into their seats she can't stop smiling. She gets like this after good sex, her eyes dancing, the pink flush over her cheeks. She deftly tugs up her pants and re-does her belt, and for some reason he's utterly swamped by how unbearably beautiful she is.

She runs a hand over her tousled hair and merges the car back onto the highway like nothing just happened.

"You need to shower." He pauses. "I could help with that, you know."

Her lips quirk up, but she keeps her eyes on the road. "I know you can. You did this morning."

"Can we agree that this was possibly the best ever use of a police car?"

She twitches an eyebrow at him. "New car smell makes you hot, Castle?"

He just grins. Because it's not new anymore.

They've christened it.