I propose dirty things to my innocent big-ass stepsister and end up fucking her hard, until I put all my delicious milk in her.

*Stepbrother grips stepsister's plump ass cheeks as she bends over to pick up something from the floor. He pushes her panties to the side and slaps her juicy ass.*Stepbrother: (in a deep, domineering voice)"Do you like that, baby?" Stepsister: (acting innocent and blushing)"What are you doing? Stop it!"Stepbrother thrusts his hard cock against her soaked panties, rubbing it against her sensitive inner thighs. He roughly pulls her panties off and positions his engorged member at her entrance.Stepbrother:"You're so fucking tight... you want it, don't you?"*He roughly pushes his cock into her, filling her up with each stroke. She groans in pain but also pleasure as she feels herself being stretched by his size. She knows she should resist, but the animalistic way he's taking her is too overwhelming.