"I'm just a butler, after all."
"As the Phantomhive family's butler, how could I not be capable of this much?"
How could hearing those familiar, unchanging lines make anyone happy? Perhaps, just perhaps, a contract does not mean loyalty. Betrayal can happen at any moment.
I have long forgotten how to smile happily. Revenge is only a pretext, an excuse! Without hatred, I don't know what else could prove that I exist.
"Sebastian, I command you: once the contract is fulfilled, devour my soul!"
"Yes, my lord."