Sirius totally knowing Remus' middle name is John but whenever he breaks out full name he'll throw in ridiculous middle names like
"OF COURSE he got a perfect score on the Charms exam, HE'S REMUS THADDEUS LUPIN"
"REMUS MICHELANGELO LUPIN, I AM SURPRISED AT YOU"
"Fuck, Remus Elizabeth Lupin-"
headcanon accepted
