"Swapped in the Black"

Prompt: A Jegulus + Wolfstar ff of Sirius and Regulus waking up one day in each other's bodies. Sirius having to deal with Evan Rosier and Barty Crouch first thing in the morning and having to act as his brother, and then later getting ambushed by James into a broom closet and finds out Regulus and James had been seeing each other. Meanwhile, Regulus waking up to Remus Lupin and having to act as Sirius, finding out Sirius and Lupin are a thing. Them having to reconcile in order to fix this mess and also having to hide it from everyone.