Her eyes skimmed over the description.  Amor in Aeternum. As usual, the literal effects of the spell eluded her, but Draco was onto something. The description of the words seemed to suggest their lives would be protected against all peril. Like many of the full moon rituals, the outcome could only be achieved through intercourse and mutual blood offerings. This ritual, additionally, could only performed in a certain time frame after a connection ritual like  Cor Unum Nexum.