Maddison Miller

Okay so, I am going to be writing a fanfic for death note and I need to know it this is crossing a line: So the main characters love interest(Person A)has an older half sister on his mom's side(Person B) HOWEVER That half sister has young half sister who is the main character(Person C) So person A&C are dating and they aren't related but they both share person B as a big half sister. . . Is that crossing a line?

Don't y'all just love whattpad comments I mean some my you laugh cry because there that funny but others make you wanna uninstalle the app

Thank you for the follow!! :)