Wait For Me from Hadestown but it’s Peter and James who hear about the prank Sirius already put into motion and James, before he can even process what’s happening, sees Peter already running, while James is only just starting to trail behind him.
Peter is running faster than he ever had in his life, because while James always had Sirius, he always had Remus. So while his lungs burn from his asthma and his legs grow weaker he keeps pushing because he will be damned if something happens to Severus and Remus is forced to live with the guilt.
