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your f/o wouldnt be "out of character" for knowing all the little things about you or how you respond to things. they wouldnt be "out of character" for just picking up or just knowing things. you know where that comes from? familiarity. they may not have learned it from the get-go. maybe it took time for them, or maybe they are that perceptive or understanding on their own, but if they weren't, they would still learn it over time. your f/o can spend enough time with you to learn every little thing about you, and the f/o that cares about you so much wouldn't mind if you just suddenly needed something from them without explanation, or asking for it every time in certain scenarios.
do loud noises freak you out? do you need to hide when there's lots of people? f/o would know if you just buried into them or held their hands for them to cover your ears or your eyes, or hold your head. f/o would know over time of where that probably comes from.
f/o wouldnt be out of character. they just had to learn first before they learned you or your languages so well that they would do it on their own even if they wouldnt for anyone else. youre not just anyone, you know! you're the one f/o cares about.