For the Switch-Up AU, see Underswap.
Swaptale is an AU where Frisk and Chara are about to finish their chosen routes: Frisk is sparing Flowey and Chara is fighting Sans.

However, when Frisk presses MERCY and Chara presses FIGHT, Frisk's hand is over the FIGHT button and Chara's hand is over the MERCY button. When Frisk looks up they see Sans about to attack. When Chara looks up and they see Flowey weak and beaten.

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