hey i remember once reading this awesome story about a man who was with his wife and visited a friends house who was pregnant. while they were there the husband grabbed the pregnant womans belly and they were kicked out. when they get home the wife is mad and decides he needs to get his "desires" out so she lets him use a hand pump on her. he then pumps her till she pops. i don't remember who wrote it or what it was called. if anyone knows about this and where to find it. let me know, thanks.
Not exactly as you described, but this sounds quite similar to Alex Deluxe's Birth of a Balloon.
Twitter | DeviantArt