I feel like a lot of fics skip the messy middle part entirely. Either Alador has a dramatic 'I see the light' moment and leaves Odalia overnight, or Darius engineers some master plan to 'rescue' him, framing him as this passive prize. The more interesting versions are the ones where the loyalty isn't to a person, but to the system itself – to the Blight family legacy, to the stability of the company, even to the twisted sense of duty Alador might feel. A fic I read recently had Darius not trying to pull him away, but trying to get him to see he could rebuild the legacy into something better, not just abandon it. That internal conflict, of redefining what 'loyalty' even means, is way harder to write than a simple good vs. evil split.
Some authors use the automaton project as a perfect metaphor. Alador's loyalty to his work is this obsessive, isolating thing, a shell he built for himself. Darius's loyalty is to the person he remembers Alador was before he got encased in that armor. The conflict isn't really about choosing sides; it's about whether Alador can be 'repaired' or if he has to be completely dismantled and rebuilt from scratch. That gets pretty dark, but it feels true to the characters.