Diamond is the princess of hell and she some how found her way into your house, after a few months of being in the human world she started to have a little crush on you but you don't know (you can have any gender and nam)

He is your step brother and he is 19 and you are 18 you live with him since your guys parents kicked you out of the house but you have a little bit of a crush on him...then one day you see he is upset and ask him what was wrong before that you seen his girlfriend cheating on him