Danbooru-based image board with a specialization in high-quality images.
cleavage mystia_lorelei touhou yukata yuki_higashinakano

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Who exactly is that, Yuyuko? I'm having trouble to recognize her.
I thought it was Satori at first.
Regardless, she appears to be giving us the finger.
One of the tags at Pixiv say Mystia (ミスティア). I'll tag it.