Replace father to take care of stepmother Vietsub

Brad lives with his father and stepmother Kagney Linn Karter. Brad's father is old, no longer has much sexual desire, and is not strong enough to serve his stepmother Kagney Linn Karter who is burning with desire, so Brad has to take his father's turn to take care of Kagney Linn Karter.

Replace father to take care of stepmother Vietsub