He is always ready to help his sister with her homework

The first time his sister needed his services to finalize her schoolwork, he helped her of course but asked for a small compensation in return. She was forced to caress his penis and jerk him off. Then the following times things went further since he forced her to suck him by threatening her to reveal to their parents what she had done to him the first time...And ultimately he ended up taking her different virginity, pussy and anal...Now, she calls for her fraternal services almost every day!