[Don is familiar with this reflex. From his upbringing, Robert refuses to see the difference. Maybe the knowledge really doesn't even make it into his consciousness. But on some level, he has to recognize it.]

[Don pokes a finger in Robert's direction and spells it out for him.]

I. Am not. Human. I am not at all human. Most people think I'm kind of a freak and almost everyone thinks this - [He stirs his finger in the air, indicating their relationship.] - is disgusting and perverted. I don't really care, because I love you, obliviousness and all. But they're not entirely wrong.

[He stops there, waiting for the fallout.]