Licking my teachers ass for better grade

I am not doing too well at the university, and my grades are rather poor, so I go to my professors office to try to get my grades improved. But my professor is rather not willing to change my grades, so I have to think about another way to "improvement". So I tell my professor that I have other skills that can benefit her! I know she is alone, and I bet orgasms are rare. So I undress her and lick her ass to orgasms for her! Effective way to improve grades!