tag lower abdomen ruler
Tag description Markings or a physical ruler placed on a female character's lower abdomen (between navel and pubic area) to visually indicate the depth of vaginal penetration, typically in the context of exaggerated penis size. Often includes scale markings, numbers, or suggestive text drawn directly on the skin.
note This tag is based on the popular Pixiv tag "kafukubu jogi" (lower abdomen ruler). It is a specific visual fetish where a ruler is drawn or placed on the girl's lower belly to show how deep the penetration reaches.
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