Heartmender(AU Sanses X Experimented Reader)...
After being experimented on for medical purposes,your soul started to go black and cracks forming in an alarming rate.
The scientists have no use for a defected subject so they just throw you out into the streets like some piece of trash.
Toriel saw you and took care of your injuries but the cracks on your soul are still in place.She then called the Royal Scientist,Gaster.
He injected some medications for soul injuries but t made a different effect on you.Instead of healing your soul,it turned half red and black with a huge crack in the middle.Toriel fear for your safety and took you to the Ruins to prevent any more damages to yourself.
You feel contained with loneliness and being a burden to others just made your heart heavier.
Will a miracle fix your broken soul?
WARNING: This may contain LEMONS and THEMES that are not suitable for young readers. Readers are to be advised