"The Weasley boy ranting at the walls in Grimmauld Place and whining endlessly to Potter has kept me informed of your exploits, so don’t look at me like that.  No, I merely chose to offer some assistance to the new wife of a past headmaster, whose home I now reside in.  I’ve got nothing better to do, other than to keep an eye on Potter from my portrait at Grimmauld Place."