Seems like a good candidate to merge a vampire and a harpy:
Captivating Gaze (Su): A drowned maiden can attract any characterl just by looking onto his or her eyes. This is similar to a gaze attack, except that the maiden must use a standard action, and those merely looking at her are not affected. Anyone the potoplenytsia targets must succeed on a DC X Will save or become captivated. This is a mind-affecting charm effect. A creature that successfully saves cannot be affected again by the same drowned maiden's gaze for 24 hours. The save DC is Charisma-based, and gains a +4 racial bonus against the drowned maiden's killer. The ability has a range of 30 feet.
A captivated victim walks toward the drowned maiden, taking the most direct route available. If the path leads into a dangerous area (through flame, off a cliff, or the like), that creature gets a second saving throw. Captivated creatures can take no actions other than to defend themselves. (Thus, a fighter cannot run away or attack but takes no defensive penalties.) A victim within 5 feet of the drowned maiden stands there and offers no resistance to the monster’s attacks.
Going back to the original text suggests an alluring song, too, so we could do a more direct rip-off of the harpy if you prefer.