So purely for my own enjoyment (and amusemant as I watch the game world descend into vampirism), I'd like to modify vampire npcs so that they feed regularly (it seems they don't?) and have a chance to transmit vampirism.
-I do not have Dawnguard
-I am currently using Brehalin's Better Vampires mod
-->This mod allows me to change NPCs into vampires (which is hilarious--I'm slowly converting all the Jarls into vampires. This is not a good thing to do if you actually plan on doing the main quest--it really messes up quest triggers)
Basically, I'd just like those npc vampires to continue infecting other people.

But I can't figure out how the mod changes npcs to vampires, let alone how to script npc vampires to feed.

Can anyone point me in the right direction?