vertical anus
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A deformed anus that is relaxed or only slightly gaping, and shaped like a vertical line.
This is typically seen in characters whose anuses have undergone sexual development through prolonged and repeated anal insertion, such as anal masturbation or anal sex.
If the anus has been spread horizontally and taken on a horizontal shape, do not use this tag.
See also
This tag implicates deformed_anus (learn more).