In A Heartbeat- Underfell

This takes place in the Au Underfell, where Frisk somehow falls down into the Underground at the time when Chara and Asriel are alive. *Frisk is 15, Chara is 16, so...SMUT AND FLUFF* (Underfell is the edgy version of Undertale, incase you didn't know.) (Warning: Lots of cursing.) Also a lot of spoilers for Undertale...

An Angels Love and A Demons Heart

Frisk has freed the monsters...even saved the infamous demon,Chara. Although they helped the demon against their will, they hope to change their mind and help them be happy. What will have to happen? And what will become of them? ( art not mine, credit to the artist)