My very dear boy, Severus,
I come with great news, me and Minerva are getting married! Isn't it wonderful? I come really to ask you, would you do me the great honor of being my best man? You have no idea how much it would mean to us if you would consent, that reminds me how is your love life coming along? All for now, please reply soon.
Albus
P.S I've had some more complaints from the Gryfindors, grumpy sods that they are, about your teaching methods, I think we need to have words