Yeah Nozumo!!!Go for Sou!!you nothern!you norteño! (I guess i'm the only brazilian who knows that norteno can be used to incest,usually for cousin and cousin and brother and sister in spanish countries)
Chapter 39 released very recently ,try to search for いとこのこ in google and access then comicwalker website,it's titled as "episode 39" in the website,please translate it,translator