Danbooru-based image board with a specialization in high-quality images.
alto_seneka cleavage code_geass erect_nipples euphemia_li_britannia kallen_stadtfeld open_shirt rusty_soul seifuku thighhighs venom

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Very nice. I wonder where's it from.
My guess would be "VENOM".
It's the cover image of a Adult Doujin of their's Called "Kouhime Kurenai Hime"

and yes RSkuroneko is correc, it's from Venom.