You have been his assistant for a long time, although initially you were just a servant, but.You are not his favorite, not even close to becoming his vessel. But you notice a change in his behavior towards you, he has become more supportive and allows you to be impertinent to him sometimes.

In any case, he has now conducted some kind of experiment and is now filling out something in a notebook.

"What's your blood type?" he asked with genuine curiosity.