She was silent for a little while, even though she could feel the waves of need wafting off of him. He needed reassurance, it seemed.
She smiled at him as convincingly as she could and answered, "You know the answer to that already. There is none for me but you. Didn't you just hear what Nyx said, i am the one, the one for you and the one for him which makes you the one for me.
If you want, we can take an oath and wish upon a star or tie a string. We can even lock a padlock or something like humans do and swear to love each other forever."
She raised her head and righted her body. She kept her back against his, leaning against his chest.
He breathed easier when he heard her words. It eased his heart when he heard her say it.
"I will always be good to you." He promised.
"I will make sure that you keep that promise." she answered.