Establishing a hierarchy

Go and look up the headcanon of Adagio if you don't know what's all of this about :3
So! I kinda wanted to know how exactly would Adagio and Aria do to decide who had to be leader. At first I thought that they'd just fight, but then I remembered Aria was stronger and more intelligent, so she would have easily defeated her twin sister. I ended up doing a physical fight scene anyway, but I figured that after that Adagio would have offered Aria something, if this one would have let Adagio win. The enchanting singer said to her sister that she would have given her control on the unborn third siren. Aria accepted, because at the time she still didn't know the force and power she was able to use.
It was fun doing this one, even though Aria's "neck membranes" were quite difficult. I think I'll draw them again, because I really love these bad girls. I'm quite disappointed about how they were ended in the film: running away, simple gone and with no vocal skills anymore. Ugh. I hope they will return, maybe in a third film? I don't know. Anyway, I hope you like this one ^^