Levi nodded slightly, allowing himself to drift back into sleep - until the words fully sunk in and his eyes flicked open as he felt a sudden, sharp stab of pure jealousy course through him. His grip on Belphegor tightened without him even meaning to, and it was a genuine effort to keep his temper in check.

It was... strange. Far stronger than he was really expecting to feel; when one felt a particular emotion repeatedly it dulled a little, and he wasn't used to feeling it in response to the mere thought of someone having something he wanted. It wasn't the first time he'd ever felt it so strongly, but it had been a while - he'd grown comfortable here, in a world where whatever he wanted could be gotten almost immediately, his envious nature was almost always immediately satisfied, but he couldn't control Bel as easily as he could the mortals, and suddenly he was faced with the genuine possibility that he might not get what he wanted.

It wasn't like he hadn't taken a tumble or two (or two thousand) with Asmodeus himself, or that he expected Bel to never have done so before, but suddenly the thought of the other Prince's hands on Bel made him feel sick.