"Immune," he said absently between hungry kisses, his mind beginning to work properly again. He nipped her lower lip. "Not wholly human. Or human at all." It started off about her. Or at least, verbally it was about her. For a time. She was the starting point.

Non human. Looks human. Perhaps. Maybe. Could be completely invisible.

He held her firmly, giving away that he was far stronger than he looked. The moment his mind locked on an answer (and really, there was only one,) he rested his forehead against hers so he could catch his breath. "Cherubim."