I do share a profound bond with them. Dean and I were in Purgatory together. I pulled him from Hell. I pulled his brother from the Cage. I took Sam's mental instability in his time of need. [ His interactions with the Winchesters are usually filled with quite a bit of bloodshed. He's bled more times for the Winchesters than he can count sometimes. It's hard not to fall into that pattern with them though. They were the ones to inspire Castiel to stand up against Heaven. They inspired him to rebel because they chose something that Cas could never fully grasp as an angel. They chose freewill and family. Freewill isn't something to be taken lightly either. Cas has come to realize this more often than he's comfortable with.

He's forced to look at her, but at this point he wouldn't look away. He knows what's happening right now. It's a competition of sorts. Who is the strongest. Though technically at this point it'd be her. Castiel is vulnerable and now very fragile in this state. She has all the power in the world over him, but he's not going to slink into his shell because she's manhandling him. If anything he'll hold his head higher and lean in closer. He's brave and stupid a lot of the time. A trait that hasn't completely been washed out of him after all the stuff he's been through. ]

I'm valuable. [ He swallows hard and has to find the will to say what he has to next. Everything about this makes his entire being feel unclean. He's walking a dangerous path that he's well aware of. His partnership with Crowley was supposed to be his last mingling with a demon, but then came Meg. Meg made sense, but this didn't. Still it offered protection. ] And I'm yours if you can keep me safe. [ The boys are resourceful, but defending against thousands of angels isn't something he wants to put them in the middle of. It's selfish and he's trying not to go down that road again. ]