Danbooru-based image board with a specialization in high-quality images.
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arnett_mcmillian ass atia_simmons crease cropped freezing kim_kwang-hyun pantsu scanning_artifacts seifuku shimapan thighhighs

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That looks a lot like Yoko from TTGL, I've gotta say...
Is this a meme? I saw another image that looks just like this..
You could have seen a child post. post #190376

Also i'm 100% sure i've seen other images with similar poses.
It's a stretching exercise.