Chapter Text
Rick Castle had to laugh. Here he was, watching his girlfriend Kate Beckett fucking another man. It had been his idea, and fuck, he was enjoying it too.
It had all started a few days ago. He and Kate had rolled up to the crime scene after a wild night of secret sex. Their sexual relationship was still kind of new, but they had quickly realized they liked to watch. So far, they had only indulged in watching porn together, and watching each other masturbate, but they had discussed the possibility of bringing a third person into bed with them.
Then the case led them to a hotel room to track down a suspect, and he was just walking out of the shower. Castle tried to cover Kate’s eyes (and his own), but they both managed to get an eyeful. And it was an eyeful. The guy’s cock was huge! Rick knew he was well hung, but he thought this guy was even bigger. Fuck, Kate looked at it a lot more than was necessary. When he’d covered her eyes, Kate moved her head so she could see everything. And then they found out who he was. So not only was he good looking, and had an accent, but he was Scotland Yard. Shit.
He was watching Hunt and Beckett flirt when he got a crazy idea. Maybe they should invite the Brit to be the other person in bed with them. Thinking about Kate getting fucked by that cock gave him an instant hard-on. They’d had a productive day, but they decided to leave when they realized that they would have a problem getting Nigel’s prints. He and Beckett went their separate ways, but he sneaked out of the loft after his mother and Alexis had gone off to bed. Kate let him in after his secret knock.
“You know, you can just knock, Double 07,” Kate smirked at him. She knew he loved the secret stuff – she remembered his stories of his love of James Bond. But that didn’t mean she couldn’t tease him. He walked into her apartment with a shit eating grin.
“Yeah, but Kate, he’s the coolest! “ Now he smirked at her. She was barefoot, so she had to go up on tiptoes to kiss him. He grabbed her hips and lifted her up; her legs instantly went around his waist. Their kisses went from soft to hard in about five seconds as he carried her down the hall to her bedroom. As soon as he was close to the bed, he released her and she landed on her ass on the mattress. He quickly followed her down and they kissed some more.
Since she was dressed in sweats and a tee shirt, he had her naked in seconds. He was sucking on her breasts as she reached for his belt. Soon, his pants were around his ankles as he moved down her body, sucking as he went. When he got to her pussy, he kissed it and then spread it open. He licked it from top to bottom very slowly. Kate’s hands were in his hair as he licked it over and over again. He started to pick up speed as her hands began to tug on his hair. He moved his tongue to her clit and started to suck on it. Her hands went slack, and her hips began to move. Recognizing her tells, he doubled the suction on her clit and she fell apart under him. He sat up so he could watch.
She was beautiful, and all the more beautiful in her climax. He began to stroke his cock as she came back to earth. He still had his cock in his hands, and he was about to thrust it into her when he realized he needed a condom. He looked up and she had one in her hand. Laughing, he took it from her, ripped it open and had his cock sheathed quickly. He pushed her legs apart and then thrust it home. He almost came from the sensations but he managed to get himself under control. He pumped his cock in and out in a steady rhythm. Kate was moaning and put her fingers on her clit as he thrust.
“Fuck, Kate, I’m coming!” he screamed out. He felt the come boiling in his balls as his climax built.
“Babe, come with me!” she exclaimed. He could feel her walls grabbing his cock and that was it for him. He filled the condom as he watched her come too. He pulled out slowly and got out of bed to dispose of it. When he came back to bed, she was still touching herself as she came down from her high. He climbed in next to her, and pulled the bedding up. She got close to him, and put her head on his shoulder.
“Kate? Are you sleepy or can we talk?” he said. He felt her nod so he continued. “I had an idea today.”
“That can be dangerous, Castle!” she laughed. He fake pouted, and she rubbed his chest and said, “Continue.”
“Thank you. I noticed you staring at Hunt’s dick today, and it made me think – he might be a good candidate for the third party. You looked interested in him, and I think I’d like to watch you guys have sex. And he’d be leaving, and we wouldn’t have to worry about ever seeing him again. What do you think?”
“Castle, are you sure about this? I know we’ve had fun fantasying about doing this, but to really do it?”
“Yeah, Kate, I’m serious. And the more I think about it, the more Hunt makes sense. We won’t have to worry about awkward situations. And we don’t have to worry about him saying anything to a gossip columnist, or any reporter. I’m sure he’s interested in you, too. I really want to do this.”
“I’ve got to admit I do want to fuck him. But that’s it. And the thought of you being there while this happens may be weird to some people, but I love it. Okay, let’s do this!” She picked her head up and kissed him on the lips. She broke off the kiss and threw off the blankets and grabbed his cock. She stroked it with both hands and then she moved her body so she could suck his cock into her mouth.
His hips bucked as she sucked on it. When she took it out, it was shiny with her saliva. She put one hand on his balls and the other on his cock and now he groaned. “Fuck, Beckett, you are so good at that.” She grinned at him and then sucked it down her throat. He tried to talk, but he found that he didn’t have a coherent thought. He couldn’t even move his arms to touch her at all.
Beckett knew he was close; she could feel his cock getting ready to shoot his come down her throat. She was ready and then she felt his come erupt. She swallowed it all, relishing the salty taste of him. She let his softened cock slither out of her mouth and kissed her way up his body. When she reached his lips, she didn’t slow down – he loved to taste himself on her lips. Now she pulled the bedding up and settled down next to him.
“So we agree – we’re going to invite Hunt to be our third party, right?” Kate asked quietly. Castle could do nothing more than nod. “Good,” she said as she drifted off to sleep. Castle’s very active imagination came up with all sorts of pictures of what that would be like. He fell asleep with a smile on his face.