A twist on an open request from 5x23. Please review, as always!

"Pervert!"

"That's Field Marshal pervert to you," Rick called, trying in vain with his remote control to dislodge the jacket Kate had thrown over the tank. He was about to give up when he heard the click of the bedroom door, and the lock – and saw Kate lift the jacket off the camera again. With a wicked smile, she held the toy up to her face, almost cradling it, then put it down on the bed.

Rick got up and went to the bedroom door, still holding the remote to watch his girlfriend, wondering what she was doing.

"You like watching me, Castle?" she mouthed at the camera. He gasped, and watched as Kate settled herself beside the tank, giving him a clear view of her whole body. He banged on the door.

"Okay, Beckett, I'm sorry, please let me in," he complained, pulling at the door handle. He heard her chuckle, but she didn't answer; instead she began to run her hand down over her chest, stroking her breasts. He saw her nipples pucker under the silky fabric of her top and felt himself harden just from watching her. He started to beat the door again; Kate turned to raise an eyebrow at the camera and he stopped... She wasn't going to let him in, and fuck it, this was hot...

He sat with his back against the door and watched as Kate shimmied out of that silky vest, arching her back to give him a better view. He ran his own hand over himself, feeling the ache strengthen as Kate began to slide her hands over her body. He pressed his ear to the door and could just hear her heavy breathing as her own hands did the things to her body which he loved to do himself.

Kate's fingers lowered to her stomach and Rick couldn't stop himself groaning loudly as one of her hands slipped underneath her only remaining garment. She turned to smile directly at the camera as she parted her legs more widely and her other hand made its way into her underwear as well.

"Please, Becks, let me in," he called.

"You could have come in earlier," she replied, her voice very controlled. She was telling him this was his fault, that he had started it and now she was going to finish it in a way to both pleasure and punish him. His hand found his cock again as he watched Kate work her fingers inside herself, moaning a little as she rubbed her centre.

She was biting her lip. She was showing him, too – she knew what it did to him. She closed her eyes and he hoped to God she was imagining him in there. He was.

She wasn't waiting for anything; this was not going to be a prolonged exercise. Suddenly she whipped off her panties with a movement Rick wasn't sure he had ever seen before, landing back on the bed with a thump which made the tank shake. She purred with satisfaction; he could see she was close to the edge. His fingers itched to touch her, his cock itched to be inside her, he could see so much and he wanted all of it-

She came spectacularly, putting on a bit of a show for him, he thought. He heard her cry out his name through the door, which brought him pretty close to the finish line himself. The convulsing of her body as the orgasm shattered through her didn't help either, and the little kiss she blew to the camera before she shoved the tank off the bed-

Rick increased the pace of his hand, closing his eyes as he pictured her around him, so focused he didn't even hear the door open or register her presence until she gripped his wrist firmly with her hand and kicked away the remote, which had fallen to the floor. She straddled him and lowered herself onto him straight away.

"Wouldn't want you to make a mess," she muttered in his ear as she clenched around him, using her hands to quickly remove his shirt and pull down his pants a bit further. He grabbed at any part of her that he could reach; she pressed their bodies closer as she moved up and down.

He came loudly, and his pouring into her was enough to make her come again, fluttering around him as bright white stars popped in her eyes. He steadied her; she might be quick at recovering but he could feel that she was a little shaky. When he had calmed down enough he guided her off him, at which she made a noise of complaint.

"You seemed happy enough without me before," he teased, helping her to her feet as he stepped out of his pants and led her back to the bathroom.

"You deserved it. And enjoyed it. But you know I'm happiest with you, writer boy, and that's never going to change."

If you think this one was for you, I accept pretty much any kind of gift, love, hugs, kisses, all that jazz. And, of course, I love you.