"Ah, to be young again, right Remus?" Sirius laughs and winks. "I did think about your comment about the Three Musketeers and you are right. You can join the Marauders a bit late, for now as D’Artagnan. It is male, so people don’t think about you if it is found. We hide the meaning of the letter within the stories and it would seem like two old friends are writing to each other." 