"Sebastian. This is an order." His voice is raspy by this point, having given the same three orders all night, to no discernible effect:
I order you to live.
I order you to never leave me behind, to always stay by my side.
I order you to stop being dead.
He stops his pacing at the decorative mirror and the sight is no different than before- wide, exhausted blue eyes matching, with no Faustian contract to stain his right eye. No matter how he widens them or how many lights he turns on, he can find no trace of the contract sigil. It's just gone.
Which means...it finally happened. Their bond is broken. He'd felt it fade the moment Sebastian died but didn't believe it until he'd seen his own unmarked eye. And now, no matter how much willpower he puts into his commands, Sebastian still won't appear.
Ciel grabs onto his hair in frustration, so incredibly angry over how this all turned out. This isn't supposed to happen. Sebastian isn't supposed to leave him alone. In none of his imaginings did he think he would outlive the demon. Now he's stuck here, defenseless, and his parents' murderers and his torturers are still free.
He's lost his only steadfast ally.
He's lost Sebastian.
Ciel's breath catches at that. That cursed, meddling fool of an angel, how dare he kill Ciel's butler, how dare he even think Ciel wanted anything like liberation from the bond that he'd all but seized from the demon. Yes, Sebastian is (was, Ciel's mind harshly reminds him) a demon, but he's Ciel's demon, and that made all the difference to him.
And now he's lost, unsure of himself, and in a desperate attempt to seize back his control once more, grits out the rest of his command: "Do you hear me, Sebastian?! I order you to live! I order you to not be dead! How dare you leave your task unfinished. Did you not promise me the crown of victory? Well, you can't deliver it when you're dead!"