What if I made a replaced mc au but Diavolo, or another noble demon, ask to be mc’s lover and marriage. The “replacement” student stands by mc and isn’t interested in being the brothers lover.
The new student and the noble demon snaps at the brothers for abandoning the mc and tells Lord Diavolo about their behaviors. The brothers would be suspended from RAD leading Mephistopheles to take of Lucifer’s position as Diavolo’s right hand man. Mammon would be angry at both the new student and mc for ratting them out, but mc puts them in their place which shattered the avatar of Greed .
The noble demon would replace the demon brothers leading them to be in the mc’s position. Asmo’s status as an influencer would be tainted and everyone disgusted with him.
Maybe a possible one-sided Lucifer or Mammon. Lucifer’s pride would be shattered seeing his favorite with someone else and Mammon begging the mc to come back.
Lucifer and the rest of the brothers who replaced mc would be lovesick puppies and it could either be a happy ending or not. You can decide what you think.
The brothers who stood with mc will be Satan and the twins. Despite the three being sad that a noble demon has been taking a liking, the anti-Lucifer league would be happy.