It's a Kaze no Klonoa doujin, furry/shota likely, but it could just be sudden arousal exaggerated, this could be from Fundoshi, but I am not sure.
There are 5 books on doujinshi db listed about Klonoa, still the database can be pretty incomplete with some authors, but is a start at least:
http://doujinshi.mugimugi.org/parody...3%8E%E3%82%A2/