"So, what`s in it for me?"... «Unrivaled»

"So, what`s in it for me?"
Aster studied Layla, trying to determine why she was interested in Ira`s contest. She assumed most people were after the money, but something about Layla told her it wasn`t just that. Still, money was the only thing she could think to offer. "I`ll give you my share of the first week`s marketing money."
Layla rolled her eyes. "Please, you drive a Mercedes. A C-Class, but still a Mercedes. I don`t want your money, I want something that will truly cost you."
Aster was shocked by the snub. A C-Class Mercedes beat a cheap bike any day, but whatever; Layla was trying to get to her and Aster wouldn`t fall for it. "Name it," Aster said, ready for this to be over.
"I will. Just as soon as I think of something."
Aster`s eyes widened. She couldn`t be serious, could she?
Layla paused long enough for a foreign tour group to go by, their leader excitingly pointing out all the landmarks the locals never even bothered to look at. "I`ll let you know when I decide," she finally said.
"I`m not comfortable with that," Aster snapped.
"That sounds more like your problem than mine," Layla shrugged. "And don`t even think about trying to back out when payday comes around, because I will hold you to it."
Aster gnawed the inside of her cheek, a nervous habit she`d yet to cure herself of. "You`re not going to ask for the soul of my firstborn child or something, are you?"
Layla rolled her eyes. "Why would I want your illegitimate mistake?"
Aster sighed. The girl was a nightmare.