Okay, so I read this one-shot quite a long time ago so what I remember is kinda vague...
So the story starts with the 2 friends when they are young, I think around elementary or middle school. Anyways, one of the girls (girl A) thinks that their friend (girl b) is as pretty as a doll. Then it jumps to when they are adults. The 2 friends haven't met in a long time. When they meet Girl B is prettier than when they were younger. It turns out that since they were younger Girl B has tried to make herself more pretty because of what Girl A said.
That's really all I remember. Hope it's enough info...