Feeling her lips part against his, he took that as an invitation to deepen the kiss. He wasn't forceful however, plenty content to take his time. What reason had he to rush? Adam was still a teenager in many ways, true, but he always been mature for his age. Losing his mother when he was a baby and growing up with a drunk for a father, or rather who he thought was his father, sort of made maturing quickly a necessity. Adam had devoted himself to Diana during the years they were together and he would do the same with Castiel. Perhaps more so, given that the angel wasn't phased by his dark magic. She hadn't turned away from him at that knowledge, and that was already so much more than almost everyone close to him had done.
When his lungs at last demanded air Adam reluctantly broke the kiss but didn't go far, tilting his head to let his forehead rest against hers. "You're so beautiful," he murmured, eyes half closed as he soaked in her presence. It wasn't simply physical beauty he referred to either. Adam couldn't immediately connect with her energy through touch the way he could another witch but he could sense her energy all the same. Without a doubt it was stronger than anything he had ever sensed, even when he briefly held the crystal skull, the most powerful source of magical energy he or any of the other witches had ever heard of. That energy had been powerful but dark, so very dark after having been corrupted by John Blackwell. This energy he felt from Castiel... it was like the warmth of the sun on a perfect summer's day. That same sunlight could burn if one wasn't careful, but Adam wasn't afraid. He had no doubt that the power of an angel was many times his own. It was simply that he had no reason to fear her or her power.
"What's it like, to be an angel?" Adam asked softly, lifting his head so he could better look at her. While his hand in her hair had moved down to rest lightly at the back of her neck, his other hand which she had first taken still held hers only his fingers had moved to entwine with hers.