General: body outline
When a character's body is clearly seen pushing against the skin from the inside of another character, creating a distinct outline. Commonly used in images featuring vore.
The features of a character (such as limbs, hands, or a face) must be identifiable from the outline to use this tag. If it is a simple round or amorphous bulge use a different tag such as abdominal_bulge or throat_bulge where appropriate.