X (let’s say Castiel) is a teacher in a government-controlled compulsory boarding school (what’s with me and totalitarian dystopias? Gen Y socialist, go figure). Information is very tightly controlled, so he’s unaware that most of the children there were abducted as punishment for their parents’ dissent. Generally he believes that the government is harsh, sure, but that’s for the greater good. The tutelage is world-class, minus the gaping holes where ideas of freedom, dissent, and self-determination ought to be.
Y (Dean) is a widower who spoke too loudly in the wrong bar while drunkenly bemoaning his problems. It wasn’t his first offense, so his daughter (or son, or whatever) was taken from him to ensure he wouldn’t “compromise her upbringing with disruptive indoctrination.” Over the course of months, if not years, he tracks down where they’ve taken her, and sets out to lure one of her teachers into letting him close enough to rescue her.
He befriends Cas under false pretenses, but turns out to actually like the guy; they have some lively and very private conversations about whether it’s better to have peace or freedom, and how much a comfortable life is worth if you don’t get to make any decisions. This has him conflicted because he’d have to come clean to make any chance of being with him (even just bedding him) real, but his kid comes first.
Eventually he’s ready to enact his plan to spring his kid, and he tells Cas about it – though not the full thing, he’s not gonna show his entire hand. It mirrors the 4.22 scene: “I do that, we will all be hunted. We’ll all be killed.” “If there is anything worth dying for…this is it.”
At the eleventh hour, Cas comes through for him, and runs distraction to draw off the security that’s coming for them. (”I’ll hold them off, I’ll hold them all off!”)
On the train to Elsewhere, Dean and Emma sit watching their homeland disappear into the distance, and someone comes to sit in their compartment. Before he can reach for his sidearm he hears a familiar voice grit out: “Hello, Dean.”