Chara and frisk went to scratchtale to kill some people (with a little Gaster help of course as u seen the full story) they saw scratch chara and scratch frisk, both of them were confused.
I WROTE THIS WHEN I WAS 15/16 I'M REALLY SORRY LADS
Chara is stuck in a spiral of Evil.
Sans and Frisk are happily living on the Surface.
The LOVE is gone, and replaced with love.
All Gaster needs to do is interfere with a moment.