| Quote #1
[…] there was that in his eyes and in his bearing which made me remember that I was a prisoner, and that if I wished it I could have no choice. The Count saw his victory in my bow, and his mastery in the trouble of my face […] (3.15)
Jonathan is powerless in Castle Dracula. Look at the language he uses! He knows that the Count has "master[ed]" him.
| Quote #2
I closed my eyes in a languorous ecstasy and waited – waited with beating heart. (3.32)
Even as he's about to be kissed/bitten by the sexy vampire, Jonathan remains passive and still.
| Quote #3
'How dare you touch him, any of you? How dare you cast eyes on him when I had forbidden it? Back, I tell you all! This man belongs to me! Beware how you meddle with him, or you'll have to deal with me.' (3.34)
Dracula doesn't try to hide that he's in control, does he? He actually claims ownership of Jonathan.