"–our unfortunate indoctrinated Asmodean is not."

"Do you want to continue trying to play reference class tennis, or are you going to accept that we don't want to interact with your insanity on the terms you're offering?"

"We'll contact you again if our terms change in your favor or circumstances otherwise merit."

And the interaction ends.

(They're not even confident an Axiomite would help. Carissa's claims about Hell-Axis relations described them strangely distant.)

Meanwhile, Carissa has been thinking. Her captors really seem to be saying she shouldn't anticipate an adequate afterlife or undeath no matter how cooperative she is. It's not clear why they want her to think this – wouldn't it make much more sense to say she's stuck with them forever with her soul intact?

Given that this claim is kind of disruptive to her planning algorithms, she's falling back to the fact that if her captors were regular people them giving her a bathtub and clothes would clearly mean they want her to make herself attractive to them, and the celestials' insanity doesn't seem to suggest any opposition to her bathing, so she's taking a bath.

The bathtub is straightforward to operate. It provides a really, really comfortable bath. The soaps work, if through magic and not normal alchemy, and the scents are pleasant and go well together, if unfortunately illusory. The heat transfer is real and very comfortable. Despite Endure Elements working for Worldwound conditions, Carissa hasn't been this deeply warm for a while.

Does she want to use some bubble solution, a washcloth, a comb, some water jets, or that sort of thing?

Even after reading the writing on the bottle, she is not really clear on how bubble solution will make her look prettier and, after trying the water jets, is also confused about those. She will use the washcloth and the comb, as she is familiar with the functionality of both of these.

She finishes bathing, drains the tub, opens the tub door, walks out onto the floor towel, dries with more of the towels, and has a look at the clothes. What's on the top of the clothing pile?

Some richly dyed indigo silk garments and a pair of matching-color but non-silken slippers. They're not actually all that skimpy or form-fitting, but they'd probably be a great texture to put on your concubine. (Because they're just, generally, a really nice texture, and having too many annoying rigid bits would also make them bad pajamas.)

The slippers wouldn't be very good outdoor shoes, but even if this cube has a well-defined outside and isn't just its own demiplane with some tiny control booth or something, there's no real reason to think that such an outside would have a floor.

She'll put them on. Being dressed in her uniform hasn't helped much. Maybe if she wears their clothes it'll at least make her captors think a little less 'untrustworthy Asmodean' when they look at her. (And it would actually be really nice to wear some other clothing. Prestidigitation cleaning or no her uniform isn't suitable for constant wear.)

She stretches and runs her hands over the fabric sensually. (It's not a hard script, it doesn't take much of her focus.)

What's a phrasing for this that doesn't disrupt her captors' "pretend they aren't threatening the prisoner" thing.

"What would you need from me to prevent me from accumulating soul damage going forward?"

"Under typical circumstances, we would say we definitely could not make you such an offer if you were not interested in stasis. In the context of other allegations made against Charon, it may be the case that if we successfully demonstrate you were not previously subject to soul senescence, it would not be found to be a treaty violation for us to offer you preventative care. However, that still leaves implementation in question, and given that this has historically been illegal, we are not experienced in this domain. There was in the past year a case in which an entity was found to have performed successful reversal of soul damage, but that entity's identity is not a matter of public record."

"If we were to pursue this process, it'd likely involve invasive inspections by Axis that they'd require your cooperation with, and might end up involving you testifying at a hearing or such. If you got what you wanted, it might ongoingly constrain your actions beyond the constraints you'd experience if we chose to let you go without modifying your soul – there's been terrorist activity targeting other somewhat unaging entities in the past, and while it was allegedly carried out by psychopomps whose numbers are now diminished, the terrorists appeared to have external backers."

"Furthermore, no matter how cooperative you are, we cannot guarantee success in this matter."

She's following along at first. "Welll, this normally isn't an offer we can make, but maybe in a very special case…" is a perfectly reasonable haggling statement. "That entity's identity is not a matter of public record" could mean that they're trying to imply they can find the entity, could also mean they're being vague in the way that any Lawful plane would, probably the latter. "We need your consent to invasive examinations and for you to testify for us and you should really stay here" also make sense as things to say.

There isn't really any clear way to parse "no matter how cooperative you are, we cannot guarantee success in this matter" as fitting within the "we don't want to make threats or set conditions openly, but…" framework. Which maybe means it's actually true? It's not clear why you'd say it if it wasn't true.