Write a story incorporating the following passage, including a lead up to it and what happens afterwards:

"Hold your breath", he exclaimed, which I did.  He pinched my nose shut and took a deep breath, clamped his lips to mine, kissed me and started blowing steadily into me, emptying his lungs and simultaneously pushing down on the pump handle.  He was blowing me up and pumping me up at the same time.  I felt the air filling my belly from both ends, gurgling its way in, cold at the bottom, warm at the top, and it just kept coming, surging into me relentlessly, pushing me out excitingly and scarily, making me bigger, rounder and more bloated at every moment.  When would it end?  This was just mindblowing.  I felt the skin of my stomach pushing out against the tightening zip and waistband like some thick, fleshy bladder, and it was pushing up and down too.  Just as I started to wonder how much more air I'd be able to take, he stopped and took away his mouth, clamping his hand over my lips.  He was panting a little.