The Butler, In Attendance (その執事、随行, Sono Shitsuji, Zuikō) is Chapter 36 of the Kuroshitsuji manga.
Elsewhere, Sebastian and Ciel prepare to board a train. Before they can get on, a young girl asks if they would like to buy an orange, which Ciel orders Sebastian to get. On the train, they discuss the fact that they are going to the workhouse where the first-tier members were brought up. Ciel states that the reason for this is because the patron of the workhouse is gone, so he intends to introduce himself to an earl near the workhouse.
Sebastian, while peeling the orange, asks if he is being sympathetic, but Ciel dismisses this, prompting Sebastian to question why Ciel killed the children he was supposed to save. Ciel states that it is because they had become so far gone under Baron Kelvin's influence that death was kinder. Sebastian comments that Ciel is being arrogant.
Once off the train, they hitch a ride on a stranger's wagon and walk the rest of the way to the Renbourn Workhouse, which they discover is completely ruined, indicating that Baron Kelvin had lied to the first-tier members about taking care of the other children they remember being there. Sebastian speculates that Doctor used the other children there to make the artificial limbs.
Ciel, on the other hand, finds it greatly amusing that the thing they worked so hard to protect, even sacrificing themselves for it, did not exist. Ciel states that by being a human, he is similar, as he works so hard to get over the horizon himself.
Sebastian cheerfully agrees, stating that that's why humans are interesting.