How do I feed on people as a vampire or vampire lord?

For a quest, I have to seduce Dexion Evicus then to feed on him. I succeeded in the first task, but the second is becoming annoying: I've reduced his life-total many times to zero, but I don't get the option to feed on him.

So - while I'm in the Vampire Lord form, how I can I feed on him?

I accidentally fed on a previous thrall, but I just can't reproduce that.

Solution 1:

You have to wait until the target is sleeping. Then, go into sneak mode and click as if you are going to pickpocket them. You will then be presented with a screen asking you if you want to feed on the target or pickpocket them. Just make sure that nobody is watching, because you will get into trouble with the law and will have to pay your bounty or go to jail (because feeding on people is illegal).

Solution 2:

You have to be in human form then use vampire seduction then try to talk to the seduced. It will ask you if you want to talk or feed - select feed.

Solution 3:

• Use a power attack on them when they are about to die in melee with Vampire Lord.
• Talk to them while they are sleeping or try to pickpocket them when they are sleeping to feed.
• Use vampire seduction on them while and then try to talk to them in the Dawnguard expansion.

Those are all the methods of feeding. Also if you are a blood-starved Vampire Lord you dont have to feed. These methods work on PC, but I'm not sure about Xbox.