Maki-chan to Now.

One night, the protagonist, an unsuccessful light novel and eroge writer, sees his beautiful next-door neighbor, Maki, masturbating on the balcony. A proper, intelligent beauty like her and yet... "Ah, you have found out my degenerate activities. Then it means that you are going to blackmail me, right? So ravish me, break me, force me into perverted sexual acts as much as you want!" It appears that she is a huge nymphomaniac, yet she is still a virgin. And so, for some reason, the protagonist decides to go out with her. Thus, their everyday full of nothing but sex begins. [Translated from Official Site]