The artist who put this on pixiv isn't the original artist. Which is why the words have been added with the MSPaint spray tool. Obvious, really.

A quick search through IQDB revealed that the source image isn't on danbooru, but it is on gelbooru. Here:

http://gelbooru.com/index.php?page=post&s=view&id=977577

While the artist is correctly identified there, the source link is, sadly, broken. (Or I would have linked to that instead.)

I found the original on his website here. Click the small triangle on your left.

I had the original, but found this one via IQDB too.
I honestly thought this was just an updated version.

This version is also low res and kinda pixelated

+1 Internets for you detectives of danbooru

Is that the MS Paint spray tool?