Danbooru-based image board with a specialization in high-quality images.
fukamine_riko gift mitha seifuku thighhighs

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Since it is a piece of CG in the game, I think the child one must be upscaled.
if res was 800x640 or something
and the other has 8xx i guess it was captured via some kind of screenshot-software with wrong resolution set as base
not only resolution, also compression. the child post must have once highly compressed, then recompressed at faked quality. terribly scam :/