My husband's brother flirts with me all the time and I tent to flirt back. Does he want more or is this harmless?

He'll touch me and play flirt with me and the other day I gave him a hug and he kissed me on the cheek and he's never done that before. Also when he hugs me he wraps his arms around me and rubs his hands up and down my back hold on for a long time. Am I reading into this too much?
My husband's brother flirts with me all the time and I tent to flirt back. Does he want more or is this harmless?
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