never heard of it sorry but i'll bump for interest because i love doujins and black girls and its rare the two meet.
I too am looking for a doujin though perhaps somebody could help me?
it was about a kid with long hair he was between 15 to 20 years old I'm not sure and then he goes to some school to become a warrior or assassin, although that part I don't remember exactly if thats what it was, but anyway all the students there are girls who are slightly older in their 20's while he's only a couple years younger and the female instructor ties the boy to a tree and tells all the female students to pull out his cock and touch it with their feet so he's being given a footjob by like 10 at the same time do you know it?

sorry I know it was a poorly constructed post but yeah.

Bump. This sounds really interesting

http://g.e-hentai.org/g/7505/5d13866029/