Blood, Sin & Soul. Three things she needs to earn. 

"Souls is once our victim kills a person, then we earn a 'Soul' which we can use for our wings, to make us fly higher and faster, it also makes us stronger" 

The tall guy's voice visited Sooyoung's mind. Sooyoung laid her head on the soft pillow. She let out a deep, tired sigh and closed her eyes. On the other hand, Tiffany was busy working. "Hey Sooyoung, what took you so long to come here? Taeyeon said you'll came yesterday, did something happen?"

"They brought me to Jessica, she wa---"

"No! Don't call her like that, you'll get punished.. Call her Lord Jessica." Tiffany once again whispered something on the pink crystal ball on the 

Kill her, Boa.. Kill her~

"What are you doing, Tiffany-ah?" The long legged girl raised her eyebrow. The milky white girl ignored her and continued to whisper like a real demon. "Psst, Tiffany~aah"

"Oh, sorry, I'm working. I need some Soul, Jessica pulled one of my longest feather" Tiffany frowned. "I forgot to pay her some blood, so she punished me" The short girl added and whispered on the weird looking ball again. Longest what? What does that have to do with souls?  Sooyoung thought, curious. 

"I'll just have some rest first"

"Suit yourself"

-----------------------------------------------

OMG Sorry I can't give you a long update, but here's my supposed to be update, this chapter was written a few months ago :<