Male Body Inflation
 

Here are a couple of pictures involving... well, as the topic title says, male body inflation. The second pic doesn't have any actual process really... But just consider it a continuation of the first one, I suppose.

The artist who did these is Fyuvix, whose work you can see here: http://fyuvix.deviantart.com/

She mostly does anthro and/or weight gain from the looks of things.