I Fucked my Elder Brother's Friend who is also my school teacher (Part-1)

I am a university student and I am very weak in my studies, so i started taking tuition from my elder brother's friend who is also our school teacher as well but nothing worked i was still not able to clear my exams and as my father said he will get me marry if I fail this time, so i did a agreement with my step brother's friend that he will fuck and let me pass in the exams