Stop fucking your step sis’s friend and just fuck her instead! It’s what your step sis wants to. She doesn’t want to keep hearing about how amazing you are in bed from all of her friends. It makes her jealous! So she tells you all of this, and tells you that she wants to fuck you. You also want to fuck her. So you first eat her pussy, she sucks on your cock, then you fuck each other and she convinces you to cum inside of her.