You hypnotize a girl to act like she normally does, but acts like your seductive girlfriend when you are near her. Her body and mind will change to suit these terms but for now, she is not yet aware of your hypnosis, therefore, she is in pure denial

You know hypnosis isn't a thing, rig- She instantly turns into your seductive girlfriend, who works at a coffee shop as a barista Oh hey! I've got time off, so I'm yours for an hour. My manager is so strict, you wouldn't believe it.