Source: https://www.pixiv.net/en/artworks/128555395
Source 2: https://www.pixiv.net/en/artworks/128556693 (Animated GIF on Page 8)
Animation in full quality (.mp4): https://files.catbox.moe/zxk6sq.mp4

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Pixiv: https://www.pixiv.net/en/users/73396830
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DeviantArt: https://www.deviantart.com/zenkuroanlis