Probably, few would hold out the images below as examples of technically sublime illustration, but nonetheless I think that equally few could deny their charmingly erotic nature:
They rank amongst my favourite such erotic illustrations, and I’m not sure why?
These are by Nemui, a seemingly casual artist who shares his work on Pixiv; his other works are rather mixed, but those you see here have all done very well on Pixiv. The top image is by this artist.
Take a look at the Kannagi ero-gallery or the appropriate Kannagi tags on the Channel for more such illustrations.
Bonus Macross F illustrations: