DDK-129 - My younger cousin who moved in with me is a sex-crazed high schooler who won't stop milking me dry.

She's quite the aggressive one, tying him to the bed while he's asleep. The way it starts off secretly and gradually escalates is good. The plot development is fine, but once it shifts to the father, it loses its direction and just fizzles out with a generic ending. I think it would have been better if it ended right before the father's part.