I feel like we always assume the marauders found out Remus is a werewolf because they’re clever–which, in part, yes–but remember that Remus Lupin nearly flings his briefcase across the room when Harry asks if he knew Sirius and he’s like NO WHY DO YOU ASK??? So, I think more realistically, 13 year old Remus was probably even a worse liar than 33 year old Remus and it’s a miracle the whole school didn’t find out
The Marauders, during breakfast
James: So, Remus, we we were wondering…
Sirius: Where exactly do you go on the full moon every month?
Remus: *jumps up from his seat*
Remus: *knocks over his cup*
Remus: *throws his eggs out the window*
Remus: NOWHERE WHY WOULD I GO ANYWHERE WHAT REASON WOULD I HAVE TO DO THAT
“hey remus, how are-”
“WHAT WEREWOLF!? I DIDN’T SEE ANY WEREWOLF OR HEAR ANY OF THEM? WHY WOULD YOU THINK I’M A WEREWOLF!?”