A Demon Lord’S Obsession novel Chapter 11

Demon lord Leon is looks like the cover.

But without the scales on his arms. You could also say he looks like Deablo from "How not to Summon a Demon Lord"

Luna looks like Lulu from "Death March into a Parallel World"

If you want to imagine kinda the aspect of the two chapters that came before just look at her in "Death March" on the first night she is with her new master.