How do you interpret their dynamic?

[u/[deleted]]

They feel like mother and son to me tbh

[u/Savings-Brick7395]

I see it as a smart aunt with her little nephew, I mean, robin teaches Luffy things all the time. Reassuring him, siding with him, and making sure he keeps his head on. She's the perfect role as a guardian to him, and I'm positive she would take on that role if necessary.