Here's another theme I'd like to explore. I'm thinking of when the source of the process is closely connected to something physical that must be touched/held (or stepped inside), and the longer you do it, the more process you get. Needless to say, the process is probably rather slow.
Some examples could be:
- For every minute you stay in the magical pool, you grow one year younger.
- The longer you hold the alien rock in your hand, the more you absorb its power and grow stronger/bigger.
- The longer you stand within the magic circle, the prettier you get.
- The longer you stand in front of the BE cannon ray, the bigger they get.
Some interesting plot twists could be:
- The moment you let go, you revert.
- You can come back tomorrow for some more. And the day after that, and the day after that...
- ...or the opposite: only one visit per customer, so make the most of it!
Got any media centering around this theme? Post it here!
Sadly, I don't have much to contribute myself. The closest I can think of is this Male Growth:
He-Man: The Dragon Invasion