Well, it's not really discernible whether or not Etna is naked from the waist down. If you look carefully, you can see that the bottom part which might on a quick first glance, be perceived as a private area, has no genitals. From the way Etna is positioned at an angle on all fours with her upper body raised higher than her lower body, I would say that it is actually her tummy underneath her belly button that is sticking out and not her privates (There is no infamous "Camel toe" to be seen - If anything, her (Clothed?) genitals (Maybe she's wearing a bikini bottom or panties? It's hard to tell in that picture) are probably located behind the fold of her tummy, hidden from view [To be fair, take another careful look]). If you look at the original source on Pixiv, you can see that the artist deliberately illustrated it that way. I did not edit anything down at that part of the picture.
According to the Etna Wiki (See ->
http://disgaea.wikia.com/wiki/Etna), Etna is 1473 years old but her picture there makes her look like she's fourteen, so she is supposed to appear as a child (I guess that is just the style of things in Japan regarding JRPG games, anime and manga). From what I've seen over the 'Net, Etna never appears as a mature woman. Officially, she has no fully developed breasts, curvy hips or round buttocks. You can try to spend all eternity searching for a picture of Etna where she looks like an adult woman and to top it off, have her sucking on a pacifier but I doubt that you will ever find it (Sorry, I've searched for it but came up empty which is why I created that composite edit picture for you). Maybe you can have such a picture if you asked an artist who is willing to do so without any regard to any fan backlash when he/she tries to post it anywhere. Also, it says in the Wiki page for Flonne (See ->
http://disgaea.wikia.com/wiki/Flonne) that "Flonne is a very kind and innocent person who believes that everyone is capable of love including demons." Also in the JRPG games, Flonne does fight Etna, so it 's not like Etna would willingly agree to participate in any one of Flonne's experiments - I just wrote that mini-story based on that premise (I admit that I may have exercised some artistic license with it but it is okay that you didn't like it as the concept wasn't mainly based on my own ideas).
I appreciate that you appreciate my effort but I'm a little bit disappointed at your feelings about the result (I'd thought that you would like the picture of Etna with a pacifier - It was not easy to find parts of two different pictures that would most likely fit together and then create a composite edit picture from the two). Maybe I'm overreacting a little or maybe not since it hurts a bit as what you said kind of negatively hits upon part of what I am - An ARDL. I guess its like how some peeps are divided in their opinions about seeing a picture of a
nude baby faced down on top of a bear skin rug with her/his butt showing - Some people would say that it is cute while others would say that it is obscene (I would not judge in any way, the people who think that such a picture is obscene).
