Anata ga Naku made Fumu no wo Yamenai! (Volume)

is the first volume of the Anata ga Naku made Fumu no wo Yamenai! light novel series, written by Eiji Mikage and Illustrated by nyanya. It was released under the Dengeki Bunko Imprint in July 2011.

Synopsis
Let's report the current situation. In my room, I crawl on all fours and become a human chair for an elementary school girl (9 years old, her name is Alice, by the way, her breasts are none). What's more, I was struck by my ass. I'm gonna say it, but I was rather disciplined. What is this reality? Because of the horse riding play of high school elementary school students, I can't even introduce myself. I'm supposed to be a Sekishiro boy, but for some reason I decided to live with a predatory sadistic girl. For more information, read the main story.

(source: Bookwalker JP - Translated)