Brother ditched school and heard daddy and sister doing really bad things... He blackmails his sister and if she doesn't do what he says he is gonna tell mommy their secret. She begs him not to but he wants sister to show him what she does with daddy. Brother wants to cum to sister just like daddy does. She finally agrees and he cums all over her face... she cleaned up and brother wants more . She makes brother cum again but this time he fills her up. sister mentions many things like how brother is better than daddy and feels so good.