[The hand in his hair is more than just comforting -- it's a good reminder that Childe offered this to him. His immediate response to that sound of pain from Childe is almost to pull away, but doing that would just prolong this pain he's causing him, right? And he should avoid wasting the blood he's been offered as much as possible. He's already wasting a little with how messy he as this, blood staining his lips and his chin.]

...it's delicious. It tastes a little different from the blood I've had before... I don't know if I can describe it.