I have a flash for you: If the power gets shut off and the banks go into receivership, those poor citizens will have nothing with which to barter.
It's more likely this yandere wants them both dead and they'll kill them then themself.
That means they'll probably kidnap them and lock them into their house so they're forced to stay with them.
In a sense sane people are better off not even trying to understand, the bizarre-seeking type of yandere is purely insane, mad way beyond explanation.
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Once a third character gets into the equation, they will start to show their true colors.