Frisk sister had died at a young age, but she had been reborn after her Big Sister passing and freeing the monsters underground. Toriel had wanted to adopt a child, so she bad went to the orphanage in Ebott City. When she had saw Frisk little sister, she had decided to take her in. What happens when Sans finds out that Frisk had a little sister? What will happen when she finds out her sister died saving monsters and she had also the same thing Frisk had after everytime she died a flower appears somewhere on her body?