"Momma is Gonna Give You Some Good Motivation" - Get a B for a Blowjob

How can anyone expect me to have good grades if I haven't had sex yet?! That's all that I can think about. When I told my stepmom the reason I've been doing so bad at school, she said right away that maybe sex would fix it, but I didn't understand how. Girls at school are not interested in me. That's when she said that she could help me. She mentioned something about a reward system, but I didn't understand what she meant until she showed me her pussy. Who knew that all it took to get a blowjob was a B? If my stepmom's body is my reward, nobody will have better grades than me.