It was back to normal for Cross… he got his AU XTale back, and was living peacefully there with his friends from that AU on there… nothing could go wrong… right?… on one particular normal day XTale!Undyne was training with Cross aka XTale!Sans, practicing some fighting styles as Cross’s brother XTale!Papyrus was watching them train, and they were completely unaware of someone watching them

Cross/XTale!Sans: “You gotten better at fighting, Undyne…!”

XTale!Undyne: “Thanks Sans! But this isn’t over yet remember!”

Cross/XTale!Sans: “Oh I know!”

XTale!Papyrus just watches from the side line watching in awe at Cross’s and XTale!Undyne’s moves as they trained, still completely unaware of the other presence nearby watching them