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It seems quite obvious to me we're building up that putting the valves on a girl will turn them into another blow up doll. But what happens if one is used on a guy?
Either they become one of those 'inflatable hunks' you see at hen parties or they become a female blow-up doll too, probably.
The question I'm more interested in is what happens if you put cum in the nozzle?
I'd say temporary futafication, lasting until all the cum has been cummed out.