thrall
a fictional force that can be used intentionally or unintentionally to hold another in a state of complete absorption, oftentimes by a magical or supernatural being (e.g. vampire, veela, etc) in order to lure prey and/or love interest(s)
Example:
Romeo appeared to be in the vampire Juliet's thrall, eyes slightly vacant and jaw slack as he obediently shuffled closer.
Romeo appeared to be in the vampire Juliet's thrall, eyes slightly vacant and jaw slack as he obediently shuffled closer.