Passive-aggressive Frisk X Asriel

After so many resets and so many genocide routes repeated and so many pacifist routes repeated, Chara decides he wants something new, he hits reset one last time, and this time, him and frisk share the body and do one final pacifist run so Chara can experience it himself. everyone's kindness starts to thaw his icy heart, he hated it but continued to allow it, seeing it as an experiment to find out what would happen if he was nice. After the final run and everyone gets to the surface, Chara gives Frisk full control of their body and life continues as normal. Until a new threat emerges and Frisk realizes that sometimes.... Mercy just isn't an option.

This has Frisk X Asriel and yes Frisk and Chara are both boys in this story. So if boy X boy love bothers you don't read.