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I can only talk from experience but back when I had a crush on my ex gf I'd flirt and tease my other friends in a sexual and romantic way because I felt nothing but I couldn't do that with her because it made me feel embarrassed. Aside from very occasional teasing which was just my way to test the waters by seeing her reactions I was mainly reserved towards her but we did banter a lot on other topics.
Miko flirts heavily with Haachama and Ame and recently told Noel she would touch her tits and harassed her a lot during the latest shiraken minecraft but none of that shit is serious