This has been stuck in my head since the end of Always - just right after she takes his hand.
Not mine, etc
She smiled at him. Grinned really. Castle knew all too well that it was nearly impossible for Beckett to turn her brain off, but she looked at him, so consumed by the moment, that he was dumbfounded. Just stared. So when she took his hand lightly and tugged, he hesitated for only a moment before following behind, the "coming Castle?" dying on her lips before she had a chance.
She led him forward and reached the end of the hallway. Then she hesitated. For only a split second, realizing she had never been to his bedroom, had no idea where to go next and while she would be perfectly happy just sinking to the floor with him right now, she knew that, for both of them, their first time was worth a bed. So Kate confidently picked to the right and tugged him along. She gasped slightly when he pulled her arm, twisting inelegantly into his arms, their lips crashing together as though they had been doing this all their lives. She breathed heavily as he pushed her against the wall again, curling her leg around his thigh. "I figured I had a 50-50 chance" she grinned into his mouth. "How about just this once you let me take the lead?" he said, his voice low. Not waiting for an answer he lifted Kate up, her legs wrapped around his lower back and silenced her comeback with a kiss.