He needed it, her blood, she could sense it in the way he moved on top of her, the moan he gave, the desperate act of drinking it down. He was starting to need and that was all part of the outcome, it would change once Lucifer rose, but Ruby knew what a demons blood was to someone already tainted, Azazel and Lilith had told her how it would be. How much he would crave her. Of course they had none of them forseen the rest.
Like the fact he still cared about her, pushing into her as he drank, roughly thrusting inside her, filling her with more pleasure than she'd felt in a long time moans of her own joining his and the clattering of the headboard to start on his promise of being wild and loud enough to let everyone know. Hell itself, she thought excitedly mind hitting briefly on the things Lilith would do to her if she knew she'd fallen in love with the Boy King.
He kissed her chest finally sated and moved himself back facing her as he fucked her, lips and chin covered in blood, her blood.
No, she was wrong wasn't she. It was his. And he thanked her for it.
"It makes you strong" she told him facinated with this man she was helping shape. Facinated by the darkness she could feel rising in him. The darkness that she'd begun to give him. He was pushing her over the edge just by being him.
"Now...show me how strong" she asked him, hand reaching up to run down his face "Show me what I gave you"