Looking for the whole doujin (if it even is one). Purely for science reasons, it's apparently a retard raping a loli, rumor has it. Remember it being hard to find.
http://exhentai.org/g/852122/6ae7f3242f/
I found it exploring the options iqdb gave me. Enjoy
https://hitomi.la/galleries/852122.html
go ahead and research anon