Have a cup of tea with Professor Lupin for unknown reasons, ask about any homework you've been given, or leave a stink bomb in one of the desk draws.

Please do an inline comment on the office you're in!

Lupin's office
Defense Against the Dark Arts

Sinistra's office
Astronomy

Binns' office
History of Magic

Vector's office
Arithmancy

Burbage's office
Muggle Studies

Trelawney's office
Divination

Filch's office
Caretaker

Hagrid's Hut
Care of Magical Creatures // gamekeeper