NeutronStar 
I'm removing the incorrect tags: `crotchboobs`, `nipples`, `nipple bite`.
In reality there are no nipples or crotchboobs in this picture, it's just a red bite mark because of Luna's biting.
It's supposed to be stretched skin there around that mark.
(Also, this artwork was created during the early years of the G4 show, and back then people often got confused about ponies having colorful fur, and sometimes interpreted it as a colorful skin instead, because of the simplicity of animation style.)
My main two arguments about those tags being incorrect are the following:
1. This particular artist, [**artist:illuminatiums**](/tags/artist-colon-illuminatiums) , **never** had crotchboobs in their arts. The only few that are found, are edits made by some other people, adding those crotchboobs.
2. In this artwork you can clearly see the belly areas of some other ponies, where those crotchboobs could be visible, but there are none on anypony. So that should again prove that what we see on Celestia there is just a bite mark. Luna is biting Celestia's belly skin there.
In reality there are no nipples or crotchboobs in this picture, it's just a red bite mark because of Luna's biting.
It's supposed to be stretched skin there around that mark.
(Also, this artwork was created during the early years of the G4 show, and back then people often got confused about ponies having colorful fur, and sometimes interpreted it as a colorful skin instead, because of the simplicity of animation style.)
My main two arguments about those tags being incorrect are the following:
1. This particular artist, [**artist:illuminatiums**](/tags/artist-colon-illuminatiums) , **never** had crotchboobs in their arts. The only few that are found, are edits made by some other people, adding those crotchboobs.
2. In this artwork you can clearly see the belly areas of some other ponies, where those crotchboobs could be visible, but there are none on anypony. So that should again prove that what we see on Celestia there is just a bite mark. Luna is biting Celestia's belly skin there.