This badass motherfucker belongs to Eiichiro Oda (aka GOD). And all fan-art used belongs to the artists/creators.
In case it isn't obvious from just glancing through this tumblr, Zoro is only paired with Sanji here. Don't like it? You can leave~ 'Cuz it's all over the place. Oh, and some of it can get pretty sexy, too, so. Don't complain, 'cuz I warned ya.