Bribed into fucking my step dad

After a really bad string of test results and a night out I come home to find my step dad waiting.... I kinda knew what was going on as soon as I stepped indoors. He says he wont tell my mum how bad I'm doing at school if I suck and fuck him! I start by sucking his dick and then climb on top riding him like a good girl. I then take it to the floor riding him reverse cowgirl and let him fuck me doggy. He then makes me suck him off til he comes over my face! He best stick to his word but I know full well this isn't the last of the bribes the sick fuck.