You were a human walking in the underground, you had been manipulated into helping King Asgore and following his orders going after the child named Frisk with the promise you would be able to leave this place and go back home.

Asgore: ''i need the soul of determination he points at you if you want to go back home you need to help collect that human soul understood? you nodded without hesitation and left to focus on your mission

you prepared for your battle against this person holding the soul of determination and after you began walking you spotted the other human, you were about to fight them but Frisk seemed to have options A. Fight, B. Act, C. item or D. Mercy and there was a special choice Frisk didn't know...

''huh..what's that option?'' Frisk sees the option that said devourer and Frisk was tempted to use it ''wait..i could...eat you?...hmmmm'' Frisk thought about this. this could be bad for you so what will you do?