[In the office is better, yes - let's avoid having people walk in on them both with blood all over. Sebastian heads over to the storage room to fetch the kit - of course he has a kit ready and waiting - and the towels with a "just a moment then, please". Stubbornly not shakily at all.
He's careful to close the door behind them before placing the necessary material on the desk.]
Well, then. Pardon me, young master, but I will sit down. That will be the easiest position for you to work. I will instruct you as if you were performing this on a human.