私は恥ずかしがり屋の義理の妹の宿題を手伝い、結局私は彼女をイクまで激しくファックしてしまいます

My stepsister is a very judicious girl, she always does her homework and makes sure not to miss any class. She is obedient and does all the tasks, I assign her some tasks and I end up fucking her hard.