#If u want to know for a second Peter confused Reg with Sirius and tought he was a dead man for sure

[crepus]

Canon divergent AU were Regulus wants to say farewell to Sirius and he is like

Regulus: Oh btw you should choose another double agent, don't know why you tought Pettigrew was a good option

Sirius: What

Regulus, rolling his eyes: Oh merlin, I'm not going to say anything but really, you should change him, one time I looked at him and he went so pale you would think he saw a ghost.

Sirius: No. Wait. You- are you trying to confu-

Regulus: Anyways I really need to get going now, bye

Sirius, grabbing his arm: No, you don't go anywhere until you tell me all you know.