Danbooru-based image board with a specialization in high-quality images.
hamamoto_ryuusuke hisui maid ryusuke_works tsukihime

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Now I see why she was so familiar...

I thought Hisui (and Kohaku) weren't flat-chested.
Not all artists adhere precisely to the original works. I often see flat-chested versions of boobed characters, and vice versa :)