The sacred water enchanted by reciting the verses from the ancient vampire language was something really strong and couldn't be drunk directly.
For this reason, the priestess played an important role.
The priestess would bear the pain that was caused due to the water and absorb any impurities that may be present in it. The water would then be purified fully and enter inside the bodies of the groom and the brides.
After entering inside their bodies, it would stay as energy and wouldn't really get absorbed until another ceremony is performed, which was now what Luna was about to make them do.
Luna made Lith sit cross-legged. She then bent down and sucked his cock to make it erect. After that was done, she made Alexandra to come towards Lith and made her sit on Lith's lap.
As she sat, Lith's shaft entered inside her cunt and ended up penetrating her womb when he was balls deep in her.