대학에서 친구와 함께 공부하면서 공부하다가 결국 뭘 하게 됐는지 봐

I go to a university classmate's house to study because she is not very bright, it is very difficult for her to calculate, she asks me for help, I try to explain but she still doesn't understand how I already knew the answers to the exam, so she tells me that she help with the answers then I make her pay me in kind I make her suck deep throat and then I penetrate her delicious