Flower

Asriel lived a normal life. Until him and his adopted sister went to the surface. Asriel got wounded and "died". He was turned into a flower and tried to kill Frisk (for like the 100,000th time,). He was saved from being a flower, being transformed back to normal. Only one problem... Asriel is turned back to the age he was when he was turned into a flower (9 years old). He has to relive life. Chara has gone genocide crazy, Frisk is Asriel's new adopted sibling. As Asriel turns into a teenager, he realizes things he didn't before.