I looked for a mod (or other solution) to do this for many hours, until a while ago, when I thought to make one myself.

This mod allows you to become a vampire once again, even after curing yourself. It works completely normally; it uses the normal script. Just enable and done.

Really big thanks to miguick. He told me how to fix a big issue with the script, simplified it a ton. If you use a vampire character a lot, I suggest checking out a mod of his, Vampire Power, it does what this one does and a lot more; big change in gameplay.

Requirements:
A sense of logic is an absolute necessity; if you're already confused about the requirements, you probably don't fulfill them.

Have fun, and please speak up about any issues (not that I expect anyone to download this).