<p>Father Remus Lupin usually thinks of himself as a good person; he runs a youth group, takes shifts in the confessional every Sunday, and sticks to all of his vows (yes, even the one of celibacy). But he begins to think he's being punished when Sirius Black starts showing up in his confessional booth every week, describing in painstaking detail all the very, very sinful thoughts he's been having.</p>