Tip for anyone that looks for images:
saucenao.org will find you any image that is on danbooru/sankaku complex/e-hentai/pixiv
If it doesn't find your image, it might come from deviant-art, hentai-foundry (in these 2 cases, google image search or TinEye can help you) or some random forum that isn't accessible by search engines (in which case you should indeed ask for a source here, as a last resort).