Odessa, The Pseudo-succubus.

I have this concept of a college student who died in her dormitory and now haunts the halls of the dorm. She preys on gullible young adults using her inviting sexual facade. She'd lure them into a state of vulnerability, feeding them their sexual desires until it's all too late to back out of her hypnotic allure. She'd feed herself of their vitality and life essence so she could stay young.