It doesn't scare him, but it does make him halt his movements and stare out at the wall over Billy's shoulder. Kaworu can feel his body's thermoregulation through both of their clothing. The last time he recalls being this close to a Lilim is when he was a child, when being handled by a researcher or cared for by the people charged with watching him.

Is he really... hugging him? After all that?

He'd just told him he was meant to destroy all of his kind. He might as well be one of the creatures he had been fighting for a year while he was gone.

"...Billy..." he began, not actually knowing what to say. Then, his free hand settles between Billy's shoulder blades and he loosely returns the gesture, his other arm hanging at his side as his hand grips his shoes.

Why is he doing this? Because Kaworu gave him sufficient reasons to show he'd "changed"? Because he'd gave him that little bit of encouraging advice before they stood?

When he speaks again, his voice is quiet, with some of his confusion breaking through. "Do you find me pitiful?"