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New Serena should lose her submissive side completely and becomes more playful and flirty around Ash & would like to tease him a lot. She will no longer hide her feeling for Ash and openly admits it since she already kissed him on the lip so there is nothing to hide anymore and Ash is still oblivious toward her feeling because he is dumb. However she would get angry with Ash when he acts too impulsive and often scold him & punish him by pinching his cheek. Ash will also stop treating Serena like a princess and would get annoyed when she teases him and frowns when she scold him for impulsive behavior. Their relationship will start to resemble actual childhood friends.
It would be cool if Serena start smacking characters that are truly annoying like Barry.