Thoughts on Psi Vampires?

Before I start the post, I should clarify that I'm referring to vampires in fiction - and not the real life "vampire culture", who are actually regular people just like you and me. If actual vampires really do exist, they would probably keep it a secret from us mortals. So, with that out of the way...

Psi vampires are distinct from sanguine vampires - in that it's energy that they feed on, rather than blood. They also typically have psionic powers, but not everyone with psionic powers is a psi vampire (latent or otherwise). It's also possible for mortals to have too much energy, like if they struggle with anxiety or insomnia. So, for those folks, psi vampires would actually be beneficial. If they have the ability of astral projection, they don't even have to be physically present to suck on the excessive energy.

Psionic vampires (or psychic vampires) are not necessarily the same thing as psi vampires, since it's also possible for sanguine vampires to have psionic powers beyond basic telepathy that all vampires typically have - usually those who were psionic mortals before they were turned.

Do you know of any stories when psi vampires co-exist with sanguine vampires? How closely related do you think the two types of vampires can be?