So very typical of Sirius, turn this around so that he made other people feel guilty. Even after speaking with Remus, he wasn't ready to let Sirius turn this around.
Sirius,
Don't try to make it sound like I did something wrong. I did not.
Having said that, I'd like to talk to you about this, in person. If you can spare the time, I'm at Hogwarts and not planning to go anywhere anytime. Drop by whenever you want.
I do have to warn you, Pettigrew has been hired as Arithmancy professor. No, I do not know why yet, but you should knot that before you waltz in here.