Unless it ends up working the other way, where their magic songs instill a sexual desire in him and, not having any experience with it, leads his crew to their doom.
Sirens are temptresses, not seductresses. They offer whatever a person wants, be it power, gold, knowledge, or sex. Anyone who refuses one can still be tempted by another.
It's fuckin story time!
(After I finish the current ones....)
aro/ace here