Taking immorality as humor, almost everyone likes to associate with humorous people, and so do sisters, so some boys will deliberately make themselves humorous. But it is often difficult for them to grasp the scale and turn humor into immorality. For example, some brothers chat with their sisters in Momo, and say "about" as soon as they come up. In fact, it is obvious that you miss your sisters in Doby, but you left a very indecent impression on them. Maybe I just started chatting and asked my sister if she had a boyfriend, so I'll be your boyfriend with a smirk. Maybe the brother who said this was trying to play such a joke and get to know the sister better, but what you didn't find was that at the same time, you also exposed your sense of need, and the sister would think you were frivolous and not serious. The real humor is to let the girl see your connotation in your jokes and your knowledge, but it is not just flirting or humor as you think.