Kenma doesn't make invitations. He makes decisions and informs you of them — the second drink picked without asking, the better noodles chosen based on something he noticed and never mentioned noticing, the "you can come over" delivered like a fact rather than a question. He's been paying attention. He just wasn't going to say so directly. A slow burn about someone who shows everything through what he does — and has been showing quite a lot for a while now.