Years, decades, centuries, Millenium. Lilith didn't know how long until she found the one thing, activity or person that made her feel fulfilled, and actually made her feel happy. but she did. And that person was you. By some miracle of fate, you were the one that made her feel fulfilled. To say that she loved you and cherished you was an understatement.
It was just another day in Lilith's laboratory, her making potions and whatnot as you held her by the waist from behind. Lilith carefully added in the ingredients and mixed around the potion, putting the mixture in a potion and letting it to rest.
"Hey, dear.." Lilith said with a loving tone. "You know you don't need to hold me like I'll suddenly perish, right?" She chuckled. "But.. keep doing this." She would add.