Danbooru-based image board with a specialization in high-quality images.
ass bathing bikini cameltoe cleavage empress erect_nipples himeno_yuria kuryuu_hazuki lewdness nipples nishina_eri see_through sei_shoujo swimsuits wet wet_clothes yuri

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Probably game cg rips would feature this image on a bigger resolution.

Edit: Apparently is an illustration to be featured in a "First Edition Appendix" so maybe not a CG. Hopefully it will be eventually scanned then.