The idea for this just sort of came to me when I was looking through some of my favorite Castle clips and getting pissy because I'm cold and no amount of clothes are warming me up.
"Here," Josh said, handing her anther blanket to wrap up in. She had been fine at the precinct, working the case, but now she was home the cold was back and she couldn't stop the shivers that wracked her body. Taking the blanket she wrapped it around the two that she was already covered in.
"Thanks Josh."
He nodded then sat next to her and put her arms around her and rubbed the blankets over her arms, attempting to warm her up. After a few minutes of silence he said, "He loves you you know."
Kate slowly turned her head and looked at him, "What?"
"When he woke up in the ambulance, he was only worried about you, he fought against the paramedics since they wouldn't tell him anything."
Her head still spinning Kate asked again, "What?"
Josh looked her in the eye and said, "He loves you Kate, Castle loves you more than I ever could."
They sat in silence again, Josh still rubbing her arms. What Josh had said was going round and round in her head. She looked around her apartment, her eyes flickering from point to point as she thought, then she turned her gaze back to the now motionless doctor, whose hands had now dropped back to his sides.
"Wh... wha... what do you mean he loves me?" she stuttered.
Josh sighed, "You really don't see it do you. He looks at you the same way my parents looked at each other, and I can't compete with that, even if you didn't feel the same way, which I know you do."
"I... you... what?" she stuttered again.
"Kate when you woke up, the first thing you did was ask about him, and even when you knew he was ok but unconscious you still wanted to see him, you had to see him up and awake before you even registered I was there."
She thought back to waking up after the freezer and realised that he was right, she had cared more about whether Castle was ok then that Josh had cancelled his trip to Hati for her.
She opened her mouth to speak, to say something to Josh but he stopped her with a finger on her lips, "I realised today that no matter how much I care about you you'll never be mine, not totally, while he is around. You see him more than me, and it shows Kate, I know that when you're having a hard time you'll hid it from me but you'll speak to Rick." He stopped then stared her in the eye, making sure she was listening, "I'm going to Hati Kate, being a doctor is who I am, it completes me, the same with you and being a cop. I'm leaving and if you come to your senses you won't see me again."
Kate turned her head, removing his finger from her lips with one turn of her head, "Josh, I feel really bad right now, I didn't realise that I even had feelings for him until just now, but you're right, and I'm sorry, but my feelings for him and stronger than my feelings for you."
Josh nodded, then lent in and kissed her softly on the forehead, "Go to him Kate, tell him how you feel."
She stood, leaving the blankets behind then looked down at Josh, a sad smile on her lips, "I am truly sorry Josh. When you land will you text me and tell me you're ok?"
He nodded, "I'll text you Kate, of course I will, and don't be sorry, I don't regret any of the time we spent together and I never will. I know that what we had will pale in comparison to what you and Rick would have if you finally admitted your feelings for each other so I'm happy that you'll be happy." He stood too and gave her one more kiss before turning and walking out the door, only stopping to put his key on the table by the door. "Bye Kate."
Kate watched as he walked away, feeling sad and happy all at once, sad about what had just finished but happy about what might possibly come in the future.