Delusion - Underswap AU

Papyrus knows that Sans, or Blue as he liked to be called now, can handle himself. All Sanses can.

But he just can't get that memory out of his head, Sa- no, Blue's head falling off his shoulders, Chara's face devoid of their cheerful smile.

While trying to be the best big bro he can, will Papyrus burn down their relationship regardless?

(or, Orange struggles to handle the realization that Blue is growing up, while Blue fails to understand what Orange has been through)