Danbooru-based image board with a specialization in high-quality images.
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animal_ears ass bondage bunny_ears bunny_girl fate/kaleid_liner_prisma_illya fate/stay_night illyasviel_von_einzbern kuroe_von_einzbern loli naked nipples pussy stockings tail tear_(tear0320) thighhighs uncensored

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What is up with Ilya's leg? Blood constriction from the bondage, or did the artist mis-color the leg using the same color for Kuro's body?
Looks to me like it's a very poor attempt at a shadow.
The shading + skin color all over the rest of Illya's body is just fine so I'd say it is likely indeed the artist being incredibly sloppy and for some reason using the wrong skin color on that leg.