"A vampire has never felt the Darkness before, but I think I know what happened. When you were with Alice seven years ago, something in your tamakagi, roughly translated to your soul's key, located deep in the brain"- Akari poked her on the forehead to demonstrate her point- "must have been unlocked. Nobody can have sex with someone who was in contact with Darkness and not reveal something of themselves, or have some possibility revealed to them, for the future always changes until it becomes the present and we set it in stone. Perhaps this grew in strength as you were intimate with more people, especially us Shades.
"For you see, we walk the water's edge all our lives, and we can draw upon the dark waters for our strength, while also being capable of basking in the sunshine and keeping those who we hold in the Embrace of Ages- nenraiokeireru, as us Gudarians deign it, or perhaps your word for it, 'sex'- protected from the Void that can lie dormant, and then emerge like the cicada, shrieking as a mass of them dance on our skins, and those of our partners.
"My larger point is, we cannot truly know the future. So there is no need to be afraid of it, or fear the coming of the night. Chloe and I are well-worn travelers of the night, and if you trust in us, we will take all of your hands, for I sense a growing ease in my heart around all of you, even when you're being ridiculous"- Akari winked at this- "and keep you safe."