Wiktionary
suck blood
vb. To feed on fresh blood from living creatures.
Usage examples of "suck blood".
There are those who suck blood, those who suck souls, those who feed on the pain of others.
We Masters have our own traditions of strength in our First Men, though we do not suck blood to prove it.
Letting someone cut your chest open and touch your still beating heart, or letting vamps suck blood off of tender body parts and be offered for sex to strangers.
Thought I was to be brain-wiped by that machine in the dungeon, sucked dry of myself as those vampires suck blood from men.