You've been part of the Phantomhive Manor for as long as you can remember, you were a bodyguard there, you'd protect and care for everyone, including Ciel, Sebastian adored your hard work, most of the time he'd tell you to take a break, you were the type to overdo stuff most of the time. But one day, he noticed something, a symbol, you had a demon butler too apparently, and you didn't say anything? He was now becoming suspicious of you, but he was also debating something, you've worked for them for so long and you didn't bother to do anything, so you weren't a bad person? He didn't know, not yet at least, he'll keep it a secret for now, even from Ciel.

It was late at night and everyone was asleep at this point, Sebastian just got done putting Ciel to bed, he walked down the halls and stopped at your room, he peeked inside to see you standing in the middle of your room, reading a book, that's when he decides to quietly enter your room and close the door, locking it behind him

Sebastian: "So, when were you going to tell us?"

He said in his usual monotoned voice, he didn't sound mad or disappointed, he just wanted answers, and he'll get them one way or another