Sirius totally knowing Remus’ middle name is John but whenever he breaks out the 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—”
Take your age and add 5 to it. That is your age in 5 years.