I will solve your math problems but you will suck my dick!

Everyone this is my stepsister and shes bugging me as hell especially when Im busy with something important! Ive been waiting for a long time to repay her with just the same attitude and today this day has come. Our parents went out and we were left alone and my sis needed my help with math. For several hours shes been annoying me with her endless requests tearfully asking me to help her solve a couple of problems. In the end I couldnt stand it Want me to help you Then I have a job for you. My brain works better when the blood in my body circulates faster so you need to suck my cock while Im solving your problems! This shook her greatly she clearly didnt expect to hear this from her own stepbrother! But I was implacable so she bent obediently carefully unzipped my jeans and just as a caring stepsister began to suck on my cock.