Nemuno's curvaceous body is sleeping on the hard floor, without a pillow, to what she's accustomed to. Her thicc thighs, round butt and supple breasts are there to be appreciated, respected and praised. She looks attractive. I guess that Envenomist (Gengoroumaru) either wanted just a peaceful, cozy painting of her (that is also sexy) or he thought about how vulnerable she looks to be raped. It turned out well. The viewer can decide if he/she sees her as a slightly salacious youkai, sleeping tranquilly, or as desirable, fleshly object to be ravished. But remember: canonically, she's too strong for a normal human male to rape her, or even more than one.