Despite being a familiar, Monty is in fact just a bird. He's smarter, has a longer memory, and doesn't break under the reality of having been human, in love, died, and then become a bird again.
He remembers everything about being human, but the feelings are muted, he still likes Edwin, but only in the capacity of how a bird can like a human.
He still slightly resents Charles, but that's also been shifted into the way he would feel about another bird, a romantic rival winning the mating game. He wouldn't share his food with him, but he wouldn't peck his eyes out either.
Still, he knows he betrayed them, and moving one bag to enable their escape doesn't mean much. Especially not when Edwin got tortured, and Niko died. So he's not surprised when they leave him in the house with no way out. In fact, he'd argue that he deserves it.
A slow end of starvation, or dehydration, whichever comes first, seems fitting.
But then, a day and a half later, not even long enough for him to begin to feel thirst after he drank all his water, Charles phases through the front door and finds him where he's perched in the kitchen, carefully avoiding looking into the room where Esther's device, and the bloodstain on the floor still remains.
He doesn't say anything at first, and Monty begins to think that he, a bird, is hallucinating when the one corner of Charles mouth quirks slightly. Not a smile or a frown, just the smallest movement as if he's considering.
"You know, I think we all just kind of forgot you existed when everything went down."
It would hurt if Monty didn't actually think they left him on purpose. Being forgotten is somehow less bad in his mind, you don't circle back for lost flock when a predator strikes until after the danger is over, and you've counted how many are left, after all.
"Still, I'm sorry it took me so long to get here, you did help me out in the end, even if you are on the shitlist for lying and getting Edwin hurt in the first place." 'And Niko' but Charles doesn't seem like he's able to say her name. It's too soon.
Monty just caws softly at him. 'Sorry' doesn't really cover it, but the sentiment still remains.
"Ah well, I'm here to just you know, open a window or something. Can't have you dying in here as well. Not if I can help it anyway."
It's sweet, and Monty considers him as he walks through the kitchen to force the window open, Charles is.. sweet.
If Monty were to lose to a romantic rival such as Charles as a bird or a human, he thinks maybe it's not so bad. At least he knows that Charles mate will be provided for and taken care of, as well as the rest of the flock.
He caws at him again to tell him so, momentarily forgetting that the language barrier is quite big between human and bird.
Then again, Esther always understood him, but maybe that's the witch-familiar bond in place. At least he thinks so until Charles turns around, with a wide smile on his face.
"Cheers! I'll take good care of Edwin, don't worry."
'Oh! Good. Well then, good bye Charles, I have other birds to harass. And maybe a cat or two.'
Charles' laughter follows him as he takes flight out the window, and the 'Everyone likes me eventually' echoes somewhere in the back of his mind.
Seems he was right about that.