I found it on Tumblr. It's apparently a picture drawn by a member of the Geno community here on Smash Boards as well.
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Tree Gelbman
EarlTamm
Interesting. I wonder who it is(It almost feels like it should be obvious to me). It's a great pic, and with Operation Starfall being a thing, it would be nice to know if they have joined in yet. I know a lot of people there are hungering for Geno and Rosalina interaction art.
Tree Gelbman
I'm pretty sure it's 
Ovaltine.
Ovaltine.