Claire is the perfect example of how power could go to someones head. Sergio was doing his best to try to get a raise and she gave him one,  but it wasnt monetary. She made him stay late on purpose and told him if she didnt listen to every single word and do exaclty as she said he was going to be fired. Lucky for Sergio all she wanted from him was dick and hard sex. Im sure the cleaning lady had a huge mess to clean up the next morning.