Starry

Like first of all Mimzy WILL be flirting with Lucifer just no matter what

In an instance where Alastor and Lucifer are dating Mimzy still flirts with him. Alastor doesn't mind at all because he knows Mimzy and he knows Lucifer and he knows that literally nothing is ever going to happen. At this point Mimzy is mostly flirting because she thinks the panic on Lucifer’s face is hilarious. Lucifer doesn't understand why Alastor’s letting her get away with this because he's seen him eat people who's looked at him in ways he randomly decides he doesn't like but Mimzy sends Lucifer nudes when drunk and that's fine? Yeah okay sure

In a more canonical setting Alastor is completely unsurprised by how badly Mimzy wants to fuck Lucifer. He knows she has terrible taste in men but he's still sighing dramatically and telling her that she can do better. Every time he tries to get her to stop she's just like "Alastor. I WANT A SUGAR DADDY!" And at first Lucifer wants nothing at all to do with Mimzy but then he sees that Alastor actually likes her and he does fully become her sugar daddy just to fuck with him. Alastor isn't even mad at Lucifer like yes he's a little annoyed but he's also just kind of impressed that Mimzy actually did it.

No because actually imagine the current hotel as it is and suddenly there's a flash of light or portals open up and two people come stumbling through. One they clearly recognize as Alastor though he's dressed more casually then they'd ever thought they'd see him and the other is a human who they very quickly learn is actually also Alastor.

Past Alastor hasn't made his deal with Rosie yet, maybe he hasn't even started trying to communicate with the other side so this whole thing is a shock. He's already started killing people so he's not surprised that he's in hell but also What The Fuck Is Going On???

Future Alastor actually thinks this is fucking hilarious and is not freaking out nearly as much as his past selves because unlike them they know what the future holds. They all find out he's not only still at the hotel but is actually married to Lucifer and Lilith with kids of his own (the more attached I make him to people the more everyone will freak out and the funnier it is for me specifically)

Current Alastor is trying to get them Out but the more he learns about his future the more confused and panicked he gets. He doesn't understand how he could have possibly let himself get so attached to these people especially Lucifer (human Alastor also learning he married the devil??? From The Bible???)