Yuzuki Yukari is a Voiceroid, a piece of software you can use for text-to-speech. In this doujin, she also has a physical body.

After the main character uses her for a whole month to voice porn to him, that physical body gets a bit hot and bothered. And when an update adds sex functionality (why did it didn’t come out of the box is anybody’s guess), things are primed to escalate quickly.

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Sample Pages