The monster ignored its audience (and Nick who very clearly muttered "Fuck you" after being scolded) and kept its gaze fixed on Daimon, watching with a grin as full understanding of the situation come crashing over him. "How cute, pretending you don't care," it jeered. Daimon could pretend all he wanted, bluff and scowl, but the demon was inside his ex-lover's head, after all. The things it knew, that it could hurt him with. That was the trouble with Hellstorm, and all of Hell knew it, he had that pesky human part, stupid feelings. Such a waste.
The monster smiled conspiratorially as it told him in a stage whisper, "I know this tiny piece is yours, ssssorry, but my master needs this one whole. And this shard is so much more special now, knowing what it means to you!" The demon cackled gleefully, toying with him, knowing full well the position it had him in, all the terrible possibilities. That the woman, her body, this last piece of her soul were so important to one of its master's enemies, that was simply icing on the cake.
"Her memories, I can see them all, you know. Every moment you shared, every word, every kisss. She's clinging to them, to that last little piece of humanity she has, tainted by you. And when I break her and devour it, there'll be nothing left for you to keep. No piece of her to console you if she dies. And if she manages to survive, all you'll have is this empty mutilated husk. I promise. So exorcise me, Hellstorm, rip me from here and you'll win the battle. But you won't win the war."