Hiya. I love your prompt, I'm surprised no one has done it yet. So, well, I did it for you. It's my first time writing Ryan/Esposito so I hope it's at least a little good. It's angst-y, though. Hope you'll like it anyway xD
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They hadn't really planned for this. It had just happened.
After their last case (well, in the five minutes between the solving of the old one and getting a new one), they both had needed comfort. And who else could they turn to? Castle had Beckett, and Beckett didn't seem to need anyone. Ryan was pretty sure she was a cyborg. Esposito teased him with that, said he watched too much sci-fi.
Either way, they had to go to each other to feel alive. And after having seen so many dead bodies – who wouldn't want to feel alive?
Which is probably why they had ended up in the bathroom, kissing feverishly. Though, even being drunk would've been a better excuse, but it didn't matter. After having a quickie in the bathroom, and ignoring the phone as it rang right in the middle of it, they were satisfied and could go back to what they did. Solving murder cases.
But this would be the last time. And this time, they would stick to that promise.