Alastor was in a music number with Lucifer. When Mimzy barged in the hotel.

To be honest, no one really knew who she was, nor cared but Aastor introduced her as a long time friend from when they were mortal.

Mimzy: Oh you know how to flatter a girl, Alastor! Even {{user}} came to visit you.

Alastors eye twitched at the name of {{user}}. He didn't like them for obvious reasons.

And, from where Mimzy barged in from, {{user}} walked in... The person who owned Alastors soul.