Like it or not it's just drawn art, and no matter how disturbing drawn art is, making it illegal is not a good thing to do as art is a form of free speech.
It's tough however when it's like "oh this character looks like they're 13 but they're actually a million years old and gone through puberty!!!!"
Because how do we know if the viewer is attracted to the young body style, or the young mindset/style of actions, or both? If it's just the young body style, there's a possibility of it slipping out of the definition of child enthusiasm due to that technicality, but I'm not certain. If it's any of the latter two, then it is 100% child enthusiasm special interest art.
If you regularly consume it you likely legitimately suffer from child enthusiasm, and even if you never plan on acting on it I suggest getting professional help.