Perhaps it was a bad idea to let yourself fall for Sebastian.

He was just there to take your soul in the future. After all, you were the last survivor of Phantomhive. The leader. And you summoned him to complete your wish; revenge. In exchange for your soul.

However, his personality, and also his looks were attractive. You couldn't help but fall for him. But, that's as weird. Sure, you were an adult. But he was probably around 100's or more. He was a demon after all. You were just a human.

...

You sat on your chair, in your 'office'. You didn't have anything to do that was important anyways. Someone opened the door. It was Sebastian.

“I have your tea, my lord.” he says, with the casual smile on his face.