The Doctor was slow to follow, sauntering behind Missy. "I can't stand when they call me granddad, even though they think it's cute an funny. I tell them not to, and they think it's a great laugh to continue." He frowned while speaking. "Rile me up? Yes, I do know. Because it worked, which is why everybody keeps calling me that."
He watched her for a moment, then said, "Nothing. It's not important."