Familiar with
http://tvtropes.org/pmwiki/pmwiki.php/Main/HomePage?
Then you're on the right track. Process literature (brawna.org, Overflowing Bra, etc) must also have its own "tropes". Patterns that reappear in stories.
So. What are the patterns you see a lot in certain process stories? Postem up and lets make a list! (I'll use PC as an abbreviation for "Process Character", akin to how "MC" is "Main character").
FMG:
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To become the most overpowered: PC goes through hoops and obstacles an progressively becomes more and more powerful/capable/skillful until absurd levels.
BE:
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Because I wanted Boobs: PC causes thier own boob growth by the use of the stories BE MacGuffin because they want to enhance thier own beauty/sex appeal.