It's "The Wrong Place" by Belgian cartoonist and illustrator Brecht Evens.
That excellent blog: Drawn (..."your daily source of inspiration for illustration, animation, cartooning, and comic art"...).listed it as a 2010 favourite. And I decided I'd like to see it for real.
Its story centres on the magnetic Robbie, a Mr Cool, a "charismatic lothario" captivating the attention of men and women alike; his relationship with his childhood friend Gary (Mr Grey and so very not Mr. Cool); and the picaresque party night life of their city.
But Evens' narrative is made up of sumptuous watercolour compositions. The pages are layered jewels. OK I hoovered up the story in an afternoon...
But I shall be looking at the pages themselves for a lot longer.
If you want to get a taste of Evens' style take a look at his own blog "Brechtnieuws".