You rub your stomach as another fart squeaks out.
"Man, I think I've had enough of an experience *BUUUURP* for today."
You look to at the gun and try to take in the different switches and dials- if it can turn you into this much of a slob, you don't want to get the next shot wrong. A huge belch gives you pause
*BUUUUUUUUUUUUUURRRRRRRRRRRRRRRRRRRP.*
"Woah. This thing really does a number on a guy." You say to yourself as you feel the bubbling in your gut intensify. You pat your stomach and look down. Underneath your shirt you an see a distinct curve. You lift it up and look in the mirror to find that your tummy is now looking particularly bloated- more so than you can ever remember seeing it before. You pat it and think about what it would be like to have one that's bigger.
"Dude, some other time." You stop again and release a huge fart that lasts for almost a minute.
*PHHHHHHHHHHHHHHHHHHHHHHHHT*
You feel a little less bloated, but the sensation returns quickly and you feel even more pressure begin to build.
"Okay, we're changing back now *PHHHT*" You want to reverse this all before anyone finds you, so you go back to inspecting all the features of the gun.
With a constant stream of gas coming out of both ends, you don't hear that a small hissing has started to accompany the bubbling turmoil in your gut. Slowly your stomach rounds out more, slowly inflating from a basketball to a beach ball and that each of your ass cheeks are blowing up into bowling balls. Your thighs are starting to fill your jeans too, and the small tears in the seams are matched by the button at your jeans' waist tearing through its (now weaker) hole.
Satisfied that you have the gun set to reverse you look back at the mirror and see what you've become.
"HOLY SHIT!" You stare at your ballooning body in shock. You poke and prod your bloated gut, with each ministration eliciting a belch or fart. You notice that each time you let some of your gas out, that the inflation stops and you get a idea.
Circling your arms around your gut, you hug it tight and try to pull it back into you. You feel a rumbling deep in your belly and you immediately let out a massive fart and belch simultaneously.
*BUUUUUUUUUUUUUUUUUUUUUUUUUUUUUURRRRRRRRRRRRRRRRRRRRP*
*PHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHT*
After a few minutes of the dual foghorns you notice that while your girth has decreased immensely, you're still a little bloated. All that vibrating has caused a pretty impressive boner too. But before you can appreciate anything, your gut rumbles again and a fart blasts out of your rear and you start to slowly inflate again.
"Time to *urp* end this." You point the gun at yourself and fire it...