For me it was seeing women sacrificed in a erotic way like the Conan snake scene or Oola dancing before becoming a meal as a child. I popped a boner and couldn't stop thinking about it. I think on some level for me it's about the power and control. Growing up I had sexual frustrations with women, that changed as I got older but still, I liked to imagine myself as a predator taking what I desire after facing rejection. Eventually that energy of my kink translated into the bedroom, I would dominate her, hold her down, choke her, lick and nibble her all over, lick her neck, ear, nipples and feet, even women not into vore when I would do that to them would say, "You know that dragon thing you like to do, I get it, I didn't think I would. I like it." Women love a beast, and if you open them up slowly to the idea the concept of total surrender, submission, and total beastly desire it really turns them on. My last ex would whisper "I'm your little snack, I'm yours, swallow me" I would orgasm extremely hard when she would tease me like that.
So for me it's about power, control, domination, submission, desire, oral fixation, owning her body and soul, even foot play because there's many comics where her vagina or feet are given last licks as a goodbye gesture. As for others I cannot say why you are into it. I think because we were hunted and eaten by things much larger then us in our ancient past that primal fear still lives deep in our DNA, tucked away in the subconscious. The difference is in the fantasy there's pred sentience a lot of the time, control, sometimes even sexual release for the prey, a real animal its more brutal and total. It's the same reason for the uncanny valley effect, we are wired to sense danger, if we see something that doesn't look quite human alarm bells go off. Same with the pred prey dynamic, but we add our flavors of sexuality to it. Like how I prefer willing submissive prey who surrender to me body and soul, who I dominate totally and make them the object of utter total desire, but if they won't submit then I take it by force.