Sano Kyouko from the h-anime Uba a.k.a Milk Money.

This hentai really left me speechless. I thought it was going to be a nice vanilla hentai but it was the opposite. And the studio that made the hentai is called Vanilla. What i find crazy is that the MC tried to justify Kyouko's actions. The ending was disappointing because it was a cliffhanger so we will never know what happened to Kyouko. She is a psychopathic killer but i will admit she's one hot milf.