Lady Milana wanted to ensure that this guy stopped being slow and so she punished him with her kinky trampling fetish. She had to ensure that he was in pain and that he was humiliated., That is why she took him to the woods and she used her whip and her heels to punish him. He was in pain and he was humiliated but he deserved all that he got.
Lady Milana does not like perverts and this guy was one. He thought he would excite her but he ended up pissing her off. And that is how he earned himself a trampling of his balls and a kicking of his dick. He was naked as all this was happening and that made it even more painful. The guy's cries and pleas for mercy went largely ignored by the mistress.