The queen in the palace has an action of beating Hua Fei. Does the plot need it?

In an episode of Empresses in the Palace, the emperor got up at Hua Fei's house and got tired of Hua Fei for a while. Hua Fei is wearing a red pajamas, which is really charming. The emperor said that he was happy and slapped Hua Fei's ass, but also in front of several maids! Make huafei shy even retreated a few steps.

Pay attention to the expressions of two people, pancakes, your smile ... God, it's a little obscene. There is also the expression of Hua Fei, and the director can completely shout "Ka". Ha ha laugh

I don't know if this is the action added by the actor himself. Or does the plot need it? If the actors add their own plays and pancakes, aren't you afraid that your pure Queen Yuan (here is an angel) will let you kneeling durian? Ha ha laugh ...