At first, he wanted to fight against him. He was still angry, still wanting to shout and having a hard time not punching things. So, his instincts were to fight against the kiss, but they faded after a moment; because he wasn't used to this. It wasn't normally Dean initiating intimacy like this and never with such dominance.
His eyes fluttered when Dean spoke again and he tried to find words. He didn't want words. He just wanted him. Merlin, he wanted him.