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When a duo(lovers, friends or family members) become more and more like each other the longer they've been together.
For example, a hardass and a sweetheart have been traveling together for quite some time now, and the hardass is slowing becoming more and more friendly and nice while the sweetheart start to be more stern and harsh.
They will almost never become the same personality, since as they slowing grown more alike, the less influence they will have on each other.
Edited by Andermann