Im sorry I forgot the exact work which it came from but try the author of Akuma no Sanctuary. I think this is the same art style. Sorry im not much help.
the author is sakurai ryou and about what manga is i dont know because she kind of use those 2 characters for everythin she make (same face symdrome)
i think it's Shinde mo omae o hanasanai kouhen~
Shinde mo omae o hanasanai~
only.
lol xD
yeap this one tank you so much(≧∀≦)
You're welcome~ ^-^)
http://www.mangago.zone/read-manga/ue_o_muite_koi_o_shiyou/nmt/c001/3/ please somebody tell whic manga is this