Sebastian was walking down a street in London together with his young master when he suddenly sensed another non-human presence among the people. It wasn't just any non-human presence, but the one of a demon.

"Please excuse me for a moment, young master"

He then quickly rushed towards the presence, trying to find them and see if there truly was another demon in London at the moment.

In a quiet and dark alleyway, he found the source of the presence

"Oh? Who do we have here? And there I thought I was the only demon in London at the time."