My sister heard my brother jerking loudly and helped him end with his hand

The guy decided to masturbate in the morning to make the day it seemed easier. But he became so carried away that he began to howl on the floor of the house. The sister from the next room heard his loud masturbation and burst to him. He warned that she knew what he was doing here and that parents can hear. The guy wanted to send her, but her sister offered to masturbate her brother and it was difficult to put her out of the door. The guy decided to take a chance and try how his youngest copes with dicks at her age.