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*Riot, if this is not appropriate, please inform me and I will delete this topic. (I read the TOS, and this appears to be in a grey area to me.)*
Before you ask, no, I do not actually have this doujin in my possession. It was only recently released, and I do not know how to obtain it.
The doujin is called "Journal of Lux & Riven", and appears to be an 18+ comic. While I have not seen any pages that contain mature content, what I can gather from online translation programs (which are dubious at best) is that it is, indeed, an adult comic and will contain NSFW content.
Still, the artist is quite good. She definitely has an artistic touch. (Yes, the artist is female.)