At first, she was just helping her brother masturbate...but before she knew it, she crossed the line and fell in love with him. Her birthday present was a "first sex ticket." It was the brother and sister's first experience as virgins. However, the brother was troubled by his relationship with his sister and tried to date a girl from his class. "Drink my sister's pee!" and then he forced her to cum inside him. The twisted love between a sister who loved her brother too much and her brother.