In hopes of convincing Voldemort supporters to change sides, Ron decides that he and Harry should pair off with Slytherins.

Harry and Draco are living together at Grimmauld Place, because of reasons. Stuff happens.

There are no bad eggs in the Gryffindor House, this is how it works. The good people go to the lion, the raven takes the cleverest of the bunch, the snake takes those who are rotten and the badger takes the rest. Everyone knows this, this is how it works. There are no bad Gryffindors, like there are no stupid Ravenclaws, cruel Hufflepuffs or good Slytherins. everyone knows this, this is how it works. No one goes against the status quo. This is how is goes.

Salazar Slytherin has made his decision. There's only one thing left to worry about.