Castle and Beckett try and hide their relationship from their family and friends. How does it go? Starts from the morning after (4x23 - Always)

As Kate slowly woke she stretched out her limbs feeling twinges of pain all over her body. She rolled over onto her front and stretched her arms to the side. Her hand came into contact with something warm and she quickly pulled it back in shock. Her mind went into instant panic as she thought 'Oh god! What have I done? How could I have slept with someone?' She felt the warm body next to her shift and move closer, wrapping a hand around her waist and rubbing a thumb up and down the underside of her breast. She kept her eyes firmly closed as she felt the person next to her push her hair away from her back and kiss her shoulder softly. That smell. She knew that smell. The man pressed a kiss to her temple next and she felt his warm breath on her cheek. Suddenly, it all came flooding back. Castle. The fight, her sore muscles, the rain, the swing-set, showing up at his door, she kissed him, he kissed her, and the sex, how could she forget the sex?

She relaxed her body into his mattress as the hand that was round her waist moved to her back as she felt him trace letters with his finger. His delicate touch sent a shiver down her spine but she kept her eyes closed still, enjoying the morning bliss of being wrapped up in Castle's bed. Castle meanwhile was enjoying watching the sleeping detective pretend to be asleep. He started to write her a message. The letter 'I' came first then 'K' until he'd spelled out 'I know you're awake'. He watched with a smirk on his face as she tried not to grin. She slowly opened her eyes to see Castle resting on one elbow watching her.

'You know it's kind of creepy when you watch me sleep,' she croaked out, groggily, her voice still sleep-laden.

'I was simply marvelling at how well you suit my bed, my dear detective,' he smiled down as her. She rolled onto her back and stretched again, not bothering to pull up the sheet that was dangerously low on her stomach and smiled at him. He sucked in a gasp of air as she watched his eyes roam her body before forcing them to focus on her face which was at that moment, flushed pink. 'Morning,' he said softly, leaning down to kiss her gently as he felt her sigh into his mouth as their lips met.

'Mmm' she hummed, against his lips. 'Morning,' she replied shyly. His eyes flitted down her body again and then back up to her face which had once again turned to a shade of pink. Her hair was curly and messy from the rain the previous night and she imagined she had mascara smudged under her eyes. All in all, she could have looked better. She looked up to Castle's face to see his eyes shining with such adoration and love before biting between her teeth and moving closer to him until she could bury her head in the crook of his neck. He could feel her warm breath on his neck and the fluttering of her eyelashes on his skin as he cradled her warm body to his, sighing contently. 'I didn't leave,' she whispered into his neck as she snuggled as close to him as possible. Richard Castle looked down at the beautiful woman in his arms and laughed to himself; he never thought Kate Beckett would be a cuddler. He rested his head on top of hers and breathed in her hair. Cherries. 'I know,' he said. That was all that needed to be said about it. She didn't leave, she was still here; she didn't run. She felt him run his foot down her calf and slide it between her legs until they were tangled from head to toe.

Of course, her stomach had to ruin the moment. It let out a loud grumble and she let out a laugh, tickling his neck. She raised her head to look sleepily into his eyes, at his grinning face. 'Someone's hungry. When was the last time you ate something?' He said, moving one of his hands down to rest atop her stomach.

Her breath hitched as his pinkie brushed the edge of her hipbone and then dipped dangerously low.

'I don't remember,' she said sheepishly. She pulled her lip between her teeth, worried that he'd be angry at her. His face turned into a frown as he moved his finger to her lip, pulling it out from between her teeth.

'Kate,' he said, still frowning. 'You need to look after yourself properly. I worry about you,' He said quietly, looking away. Her hands come up to cup his cheeks and pull his head so it faces her.

'I know. I'm sorry Rick. Just, putting myself first isn't something I'm used to, but I'm trying. I promise. I'll try...' she didn't get to finish her sentence before he cut her off with a bruising kiss, swiping her bottom lip with his tongue as her mouth opened willingly, granting him access. He shifted slightly until he rested above her before pulling away from her mouth and peppering kisses on her neck. She gasped as he hit a sensitive spot on her neck, before placing kisses along her collarbone and then down her chest to press one at her scar. He then circles her breasts as she arched into him, letting out a breathy moan as he trailed kisses down her stomach getting closer to where she wanted him. 'Rick please,' she moaned as he placed a kiss on the inside of her thigh before moving down her leg to kiss behind her knee. 'God, you're such a tease Castle,' she grumbled.

'Oh, so we're back to Castle now are we,' he mumbled onto her skin as he moved up the inside of her other thigh. As he was about to reach exactly where she wanted him her stomach let out another grumble. Castle let out a breathy laugh against her thigh and looked up at her. Her eyes were lidded and her cheeks flushed. Her stomach let out another growl and she looked down embarrassed and before she knew it, he had scooped her up in his arms and was moving them away from the bed. Her arms immediately went into a death grip round his neck; even though she knew he'd never let her fall.

'Castle! Castle! Put me down! What are you doing?' Beckett cried out in between laughing and struggling against him. 'Rick please,' she laughed. They both thought bad to the last time he had carried her out of the hanger and she had said that. This wasn't the time for sadness though so he placed a soft kiss to her hair and gently placed her on the floor as she griped his shoulders for balance.

'You were hungry,' he said simply, with his usual boyish grin on his face. 'And it's breakfast time.' Beckett looked up at him, noticing the height difference as she wasn't in her usual heels. Their eyes met as her face broke out into a smile. She couldn't stop smiling and she knew she was starting to blush so instead she leant forwards and pressed her lips to his, wrapping her arms round his neck, as his hands went to her hips and pulled them flush together. They broke apart panting slightly, their foreheads leaning against each other. They were both getting used to being able to kiss and touch each other without it feeling strange.

'I should probably put some clothes on,' Beckett smirked, turning so that he had a view of her arse.

'But Kate,' he whined. 'I like you so much better naked!' He moaned coming up behind her to wrap his arms around her waist. He started kissing her spine before nuzzling into her neck to smell her unique scent.

'Castle, as much as I'd like to remain naked all day. What if Alexis or Martha were to come home and find me naked in your apartment?' She asked him, pulling on his shirt from the night before which had been discarded in their frantic rush to get to the bedroom. She buttoned it up loosely so that it hung off one shoulder and fell to the middle of her thighs. She turned in his arms, pecked him quickly on the lips and plucked his boxers from the floor, holding them out to him to put on. 'Come on Castle, I need my coffee,' she smirked, grabbing his hand and pulling them out of his bedroom.