Crowley simply smirked in response, the cocky expression covering most of the concern he was actually feeling. Smoking meant an unhappy Kol, and it grated on the demon that he couldn't just click his fingers and fix that. The hand holding the cigarette even twitched slightly, as though he almost tried.
When Kol came back to bed, Crowley shifted just a little, taking a last drag of his own cigarette before stubbing it out on the bedside table. The tension in his body was slowly ebbing away as he relaxed and faced Kol. "Oh, the spell in general, promise." There was actual laughter in his voice. "I can't help it, I'm impressed when that girl gets her vengeance on. She's had centuries to perfect it."