Why would a girl who is mature and together act childish and bratty around me?

Anonymous
She only acts like that around me, its like we are always teasing each other and getting into little arguments and just doing things that may come off as infantile but its so fun and we both enjoy it. She usually tells me I'm immature and should act like an adult but she acts childish too, and if I ask her why is she being like that she says stuff like "because I'm allowed to" or something its like she just enjoys scolding me lol. Bear in mind we are only like that around each other.
Why would a girl who is mature and together act childish and bratty around me?
3 Opinion