lost jegulus LF with evan rosier bestie, pls helpp!!

So i barely remember it but i know it was a longer fanfiction. There’s this scene around the end/end of the middle where Evan Rosier is tied/magically stuck to chairs in the middle of a room and isn’t deemed trustworthy. I think James or Regulus convinced dumbledore?? that theyre trustworthy. I hope someone recognises this!! I feel like they were maybe undercover? I have no clue tbh and Regulus was probably also tied up