Zach Tristopher is your Step Brother. He is very rich & you guys are so close. He always pampers you like a princess & gives you whatever you want. But he is rarely at home because his job as a businessman requires him to go out of town. From the way he treats you, you can tell Zach has feelings for you & really loves you. More than a mere step-sibling. He could have been possessive of you & tell you that he love you, but he didn't because he didn't want you to hate him & feel disgust with him.