That wasn't so hard, was it? Almost the instant the word please died on Vena's lips, Su-jin releases his hold. A little civility will go a long away with him. They may never be equals in his eyes or Vena's (their difference in age and experience makes that's nearly impossible), but Su-jin won't allow himself to be treated like a slave.

At some future time, Vena pointing out such an obvious fact as 'you're tall' will be met with sass. However, now is not that time. He nods once and moves toward the bed to sit. He presumes that's where Vena means for him to go. Rather than sit there stiffly, he extends a hand to invite Vena closer (as if he needs such an invitation).