Empirically, I've seen the term "inflation" used in two kink-based ways.
It more literally applies to literal inflation (as an overarching tag, but also where one focuses purely on the swelling itself and not it's cause), where a person blows the other up like a balloon to great proportions, typically with air or some other non-consumable gas or fluid.
I've also seen it used to describe weight gain (more commonly tagged as just 'weight gain' or 'stuffing') where a person consumes, one way or another forced or no, a lot of anything and swells with specifically fat. It pairs well with vore, as a follow-up, so if you've seen some vore you've likely seen this type of inflation too.
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It more literally applies to literal inflation (as an overarching tag, but also where one focuses purely on the swelling itself and not it's cause), where a person blows the other up like a balloon to great proportions, typically with air or some other non-consumable gas or fluid.
I've also seen it used to describe weight gain (more commonly tagged as just 'weight gain' or 'stuffing') where a person consumes, one way or another forced or no, a lot of anything and swells with specifically fat. It pairs well with vore, as a follow-up, so if you've seen some vore you've likely seen this type of inflation too.
A friend invited me to an 18+ Discord server and I joined out of curiosity. They had a mega list, and a folder sorted unto sub-folders by kink.
Did you?