For those of you who don't know, Twinning is a fetish for being transformed into an exact copy of someone, usually forcibly and unwillingly. Complete physical symmetry is created where the new clone shares the original's appearance and even genetics. May include mental changing too on some levels.
Assimilation is generally it just happening over a larger area and population. Or becoming a clone with a group of individuals already assimilated.
Who here is into this kind of thing?
Content is pretty scarce for this but I'll post what dozen or so pictures I have.
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