Nick has an unnatural obsession will having a large rounded belly, and he will do whatever it takes to make it that way. Be it engorging himself with the blood of a victim; guzzle water, or pumping himself with air (or having someone do it for him). However he does enjoy the traditional way too.
Inspiration for the image is credited to greatwhitegut on Eka’s portal and his image: http://aryion.com/g4/view/225660
Nick is © of nickreen