hentai ouji to warawanai neko.
変態王子と笑わない猫。, lit. The "HENTAI" Prince and the Stony Cat.
A 2010-current light novel series by Saraga Sou, with illustration by Kantoku, published under Media Factory's MF Bunko J imprint. Also adapted into a 2011 manga in Media Factory's Monthly Comic Alive by Okomeken, and a Spring 2013 anime by J.C.Staff.
Yokodera Youto's inability to express his true desires gets in the way of seducing girls. Tsutsukakushi Tsukiko's penchant for saying whatever pops into her head causes her appear childish. After making wishes at the legendary Stony Cat statue, Youto becomes unable to suppress his lust and Tsukiko becomes emotionless. Together, they look for ways to fix their messed up personalities.