I fucked my best friend's step sister fat ass because of an xbox controller

My best friend Billy has a step sister. Yesterday he told me he was out of town, but was sending her step sister to my house to get the xbox one controller he had lent me. I didn't mind looking for her on Instagram to know who she was. I just kept waiting for the bell to ring around the time she would come. When I opened the door, I felt a bit shocked. Right before me, there was someone completely different from what I imagined: A fucking hot woman! Her name is Jennifer. She is blond, 21 years years old, wears braces and is 5''1