[Cute... He is glad someone with the half of their braincell is looking out for Eustace and Dokja.

Erebus lowers his head down for the scratches, and D releases the reins to not impede the movement. It's a lonely life being with a guy who does not offer you ear scratches only because he is very Business and doesn't know you want them despite being a nightmare steed.

D watches the horse, and then lifts his eyes to peer out at the middle distance almost like he is giving them privacy. But his expression is forlornly thoughtful.

It's a hard question to answer. For him, the basic necessity of shelter is ideal. It's all he needs, and, unfortunately all he thinks he deserves.

But ideal in general? Ideal to what he thinks belongs to everyone?]

A quiet and peaceful one where you can live for a long time and then die surrounded by family or friends. A place without suffering.

[Death is apparently very important to a dude who has been alive for about ten thousand years.]