does this piece of art have an actual manga? http://www.mangago.zone/read-manga/7_nenme...

sadly, I think not. ):

The artist is Takatsuki Noboru, maybe BL-game illustration.

I don't think so? But the artist is Takatsuki Noboru, so I'd check out their work if the style is to your liking :D

Here's two:
http://www.mangago.zone/read-manga/ren_ai_shinan/
http://www.mangago.zone/read-manga/adeiro_yuugi/

manga from the same mangaka
http://www.mangago.zone/read-manga/chara_cafe_relish_ni_oide/mf/v01/c001/37/

its very good but i wish it was a bit more detailed about the seme and uke

thank you!

Thanks!