It's kind of funny that girls don't realize just how attractive a good voice on a woman is. Maybe I'm just particularly susceptible to it, but it's a superpower if they'd just pull their head out of their ass and use it right.
Just try and be cute, recognize the best part of their vocal range and try to spend as much time there as they can
Sometimes you can really tell the only real "seductive" thing they understand doing purposefully is pulling their shirt down more to show off more cleavage