The Victim of Demon's curse

Once there lived a friend group.
This friend group was made up of 3 angels
Bo, Retro and Ace. Retro was a angel scientist, no other angel would wanna be around him for his cruel experimentations so he created his friends, Bo and Ace, Bo and Ace are both what I call "Fake angels" angel's who can't use light and have the color pallete of demons but are still considered angels, these angels could become true angels if they don't commit sins.

These 3 worked together in and outside the lab. They were more than friends, they were like siblings to one another a strong relationship that can never be broken. But one day, Bo snuck out of the lab and came across ?????, The devil herself....????? found Bo to be very intersting, she had never seen a angel like her before.

????? took Bo in as her own daughter and treated Bo with care. But Bo, Bo fell in love with ?????, she would do anything for the devil. ????? used this to her advantage....????? commandad Bo to stop following the angels and instead to follow her instead. Bo agree's thinking ????? also feels the same for her. But she didn't realize one thing....Bo became cursed....The demon's curse had caught her and she became ?????'s puppet. Bo soon became a wanted criminal in heaven having to flee from a spot everyday or she would hide herself in hell. The sins she commited were tragic unforgivable sins, They said she had a heart of stone, a corrupted evil heart.

One day ????? told Bo she needed angel's blood, as Bo was looking for it, she realized there was only one way she could get it....by murder, she knew she wasn't strong enough to fight Diane and Venus...and she couldn't use her own blood because she wasn't pure....but she knew one person's blood she could use....Ace.....over time Ace became pure and became a real angel rather than Bo who stayed a fake angel. Bo k-lled Ace and took his blood. as she was doing that Retro had came in.....Retro began going crazy and even tried to k-ll Bo, chasing her around his lab, but he couldn't.....he knew nothing would change if he k-lled her. Bo was banned from heaven, she wasn't even allowed in hell! 

Retro doesn't know where Bo is, he didn't even wanna hear her name anymore, nobody has ever seen an angel has cruel and sinful as her. now she's missing probably dead....but nobody knows the truth.