Alastor's ear lightly twitched, feeling the heat of that steam on it and... despite himself, despite having never really felt any sort of way when looking at another person, there was a foreign thrum of excitement in his chest.

Lucifer was cute when he begged.

The Demon hummed against damp skin, alternating between long, lavish laps with his tongue and sucking at the wound for the blood, keeping it hot and flowing. Lucifer would have his 'safe word' for when to stop, after all, and Alastor was carefully keeping his ears turned to listen for it even as he got more and more invested in eliciting more of those whimpers or begs from the King of Hell.