I've said it once before, but Sonata could potentially be someone who'd defect from the other sirens. Amd reform. (If she's given any trace of an actually personality.)

And who better to help her through such a difficult time? Considering the similarities and such. All alone… In a strange world… Trapped in a young… undiscovered…. curious body… Just looking for that certain one to reach down and softly……

…

Huh? What was I talking about?

Oh come on!
I had the lube and tissues ready!!