Their lips parted on matching smiles as Beckett led Castle through his office. He wanted to speak - tried to speak - but was still too scared of spooking the glowing creature in front of him. She smiled when they entered the bedroom, no longer Robin in the Batcave. What did that make her now? Selina Kyle? Talia al Ghul? She pushed the Castle-esque thought out of her head and turned to face the man in question. He stared at her tentatively and she simpered, the damage that she had done all too evident in his eyes. Tonight. Tonight was about showing him just how much he meant to her.

Beckett touched her fingers to Castle's lips before slipping her already open shirt off of one shoulder. He gently brushed back her rain soaked hair, both of the partners' eyes fluttering closed momentarily, before backing her towards the bed. It was a sort of dance that they did, but Castle was still tentative - still afraid that she was going to break.

But she grasped onto his biceps once she was on her back, leaning up to capture his lips with her own, another crack of lighting sounding in the distance. From there they sank into the kiss, his tongue sliding along the edges of her lips before being granted access. They stayed like that for some time, just making out on the bed like a pair of teenagers, before they both needed more.

Beckett pushed back on Castle, keeping her lips on his as she began to work at the buttons of his purple shirt. He finished the job on her own blouse, immediately latching onto her neck and sucking on her pulse point.

Castle snaked his arms around his partner's back, hand at the clasp of her bra, and moved back to check that it really was okay. Her dark eyes were all the answer he needed, the hazel almost completely engulfed by black, desire pooling in her core.

Castle's jaw hung slightly agape after ridding Beckett of her lacy bra, and he sat back on his heels, just admiring the woman before him. "Castle," she huffed out, the nerves bubbling up again, competing against the fire in her veins.

"Hm?" he hummed, leaning forward to draw one of her stiff peaks into his mouth, palming her other breast.

Beckett moaned, arching up into the warm cavern of his mouth as his tongue swirled around her nipple. "You were staring."

He releases her with a pop and pays equal homage to her other breast, smirking against her soft chest. "I can't help it, you're beautiful." She sucked in a gasp as he ran his hands down her side, smoothing his palms over her hips and pulling back. "Did I hurt you?"

Beckett let out a breathy giggle - yes, giggle. "No, you're just… sweet. You're really sweet." Castle released a hot breath as Beckett hauled him down, chest-to-chest, his mouth at her shoulder. "You're really sweet," she repeated as she ran her fingers through his hair.

Castle trailed his lips across Beckett's chest, forcing her to loosen her hold on him, and began unbuckling her pants, taking off her heels before pulling down the soaked skinny jeans.

As sexy as it was, Richard Castle stripping her bare, Beckett couldn't contain her laughter as he struggled to get the pants off of her ankles. She propped herself up on her elbows, watching - half amused, half aroused - as he got off the bed and worked the jeans off of her heels, stroking the souls of her feet as he did so.

Castle threw the jeans off to the side - grinning in victory as they hit one of the walls - before crawling back over his partner, circling his thumbs over her ankles and running his hands up her legs.

She sucked in a breath when he got the the apex of her thighs, hovering just above where she wanted him.

But that wasn't what was supposed to happen.

She needed to show him.

"Castle."

"Yeah?" He grinned, kissing the top of her thighs.

"Not like this." He looked momentarily hurt, but she reached up, smoothing her thumb over the creases of his forehead. "Later," she sighed. "Believe me, I want that. But after."

"After?" His eyebrows knitted together, confused and looking like a little boy.

"Together." Beckett sat up and began removing Castle's belt. "Partners, right."

Castle kissed her, the pair on their knees, and she shrugged off his slacks and boxers in one swift move, allowing him to kick them, along with his shoes, off to the side, joining the rest of their clothing. Castle cupped Beckett through her underwear, damp from more than just the rain, teasing the only barrier between them as he pushed her back.

Beckett grasped Castle's length in her hand, slowly stroking and smoothing her thumb over the swollen tip from where he hovered over her. Blue eyes met hazel briefly, searching for any last doubts, but Beckett only brought him to her core, running his shaft through her slick folds. "Oh my god," they spoke at once, lips searching frantically for each other as both of their eyes fluttered shut.

She positioned him at her entrance, and he slid in with one quick thrust.

Castle stilled in his position, giving Beckett a moment to adjust. Hell, he needed the moment. "You feel so good," he moaned, opening his eyes to see matching bliss on Beckett's face.

She wrapped her legs around his waist, before pressing her heel into his back and murmuring, "Move."

Castle dipped his forehead to Beckett's and slid in further, now fully enveloped in her heat, and began to slowly thrust, pulling out until he was almost completely unsheathed before plunging right back in.

Beckett lifted up, meeting Castle thrust for thrust, so that their pelvises met in such a way that every pump brought this delicious pressure to the bundle of nerves right at her front.

The pace remained slow for some time, the partners reveling in the moment, the union. However, sentiment soon turned to speed, as their thrusts became sloppier, all attempts at kissing simply a clash of teeth, until it finally became too much. "Kate, I'm not going to be able to hold on much longer."

She bit into his shoulder as he hit right in that spot and moaned, "I'm right there with you." Castle nodded and rocked into Beckett, waiting until she opened her eyes, fluttering, but open. "What are you doing?"

"Look at me for this?" He asked in such a tender, loving way, that Beckett couldn't help but reach up and capture his lips, trying to display gratitude despite the fact that they were both still very much on the edge.

"Of course." Beckett met his eyes, reflecting all of the same feelings, and grabbed Castle's hand, bringing it to where they were connected. "Always," she breathed, spurring him into action.

Only a few thrusts later were they both falling over the edge, the clamping of her inner muscles pulling him along, spilling inside with hot spurts.

Castle couldn't help but collapse on Beckett at that point - any strength, any resolve gone. She didn't seem to mind, though, simply running her hands through his hair, down his arms, trailing along the sweat at the small of his back, holding him closer.

When Castle finally rolled off of her, not wanting to crush her, and pulled out, Beckett whined at the loss of contact. He simply stood up, though, naked in all his glory and reached back for her. "Come on, I'll give you a tour of the place."

Beckett's eyebrows quirked up and she took his hand tentatively, but followed him nonetheless as he brought her towards a side room. "Castle, I'm not having any of your family walk in on us naked. I will not make Alexis live with that image."

Castle huffed out a laugh and brought Beckett into the dimly lit bathroom. "First thing, our tour starts and ends her. And second, both mother and Alexis are gone for the night."

Beckett rolled her eyes. "Okay." Castle still hadn't let go over hand, bringing her with him as he turned on the shower, testing the temperature with his free hand.

He looked over his shoulder, wiggling his eyebrows, and said in a husky voice, "Care to join me, detective?"

Beckett bit into her bottom lip. "Actually, it's not detective anymore." Castle's eyebrows bunched together, obviously confused, but she simply squeezed his hand and pulled him into the shower. "Come on, Mr. Castle. I'll tell you the whole story, but first let's get cleaned up."