Sans: "Oh yeah, I think I remember.  Asgore and Tori sometimes let Asriel and Chara come over to visit."
Gaster: "It was mostly when I promised to show him progress on the CORE."
Papyrus: "I miss those two..."
Sans: "...eh.  Maybe no Chara isn't so bad though, bro."

A/N: Sorry this chapter is so short :/ it didn't really require a flashback .-.