You might have some friction with an authority figure today, but an important compromise can be reached if you can both focus on what you agree on. They need you more than you need them, so you are in a very enviable position. Play this negotiation wisely, though. You don’t want to push too hard and make them appear to have caved in to your demands. Help them protect their reputation, and they’ll be in your corner forever and helping you in future situations.