Tsubasa hachino - 大屁股女大学生 - 他变得兴奋并内射了我！： 第1部分

My name is Nao, and I am an art student. For a school assignment, I was supposed to do a drawing of a naked man, so I asked my boyfriend to be the model. But, halfway through the assignment, it just working out with him. As I was worrying about what to do, his older brother asked me what was wrong. That's when things got out of control..