The Conversion Pool (Patreon)

A group of young adults in their late teens, thrill seeking, had managed to be seduced by a group of vampire nuns into joining their convent.

First, they'd drink until you were weak enough to be incapable of resisting.

Then they'd force your head down into the pool of blood as your human life drifts away in life's precious fluid itself. You'd be so faint and high on the poison of the bite by this point that you wouldn't even feel yourself drowning. You'd simply fade away blissfully into something wonderful.

You'd later wake up, feeling like a whole new person, ready for your new "life" in the convent.