Our Best Mate Is A Werewolf (Marauders One Shot)

The Marauders had felt there was something up with Remus Lupin. Every month he seem to get sicker and then goes away to "visit his sick Mother". One day, when he leaves after lunch in the Great Hall, shaking slightly and clammy, to go visit his Mother; they decide to follow him. Instead of going to the Headmaster's office though, he instead heads to the Hospital Wing...