Everyones reaction to Lily in Slytherin.
James Sirius Potter was a trouble maker, everyone knew that. So when McGonagall assigns to him an essay about the rules of Hogwarts she should have known he wouldn't do it the way she expected.
In which the Potters multiply, innocent godfathers are sent to Azkaban, and Severus Snape goes insane.
Lily sneaks into her brother's room one night when she is woken up by her parents fighting.
Lily was on a quest. A quest to be different. All her life Lily has been known as the daughter of Harry Poter. She hated it. In Slytherin Lily has a chance to get out of that shadow, to be known as Lily not Harry Potter's daughter. Originally called Wait What!
McGonagall assigns James Sirius Potter a essay about the rules of Hogwarts. McGonagall should know by now that James wouldn't do the essay, at least not the way she expected.