Headmaster and Mrs Longbottom stumble on the late Headmistress' diary.
Written for the 2011 Samhain Smut fest on LiveJournal. Prompt: There's a witches-only club in London that has a special Halloween party every year. On the year after Voldemort falls, McGonagall finally lets herself invite someone to attend with her.
Harry sends Draco a "just because" present. Just because.