Kind of a strange style to deal with, but request is a request.

Anyways, the main tag is by_virus20, but you should add some extra tags like: obese, fat, chubby (and facesitting ;3) to enhance output.

There was a bit too much pictures with artist tags on them, I suggest you adding: text, English text, watermark, artist name.
Have fun! And don't forget to post your works!