There was a knock on the door from behind the door of the room, she was the half-sister. Asking me to help him with his college assignments, since I was smart, so I helped him. Theory after theory I explained to him, he seemed to be still confused, as he began to write with his body bent, I began to lose focus on his lesson and instead focused on his smooth thighs. I approached her slowly and kissed her, I thought she was going to get angry, but instead she kissed me back and held my dick.