He understood that Thorin might need a moment to process everything. He was a patient Hobbit, and he was willing to give Thorin as much time as he needed. And when he felt the kiss to his jawline, he allowed himself to actually breathe again. The reception had been far better than he had anticipated, and he found that he rather enjoyed the feeling of Thorin's lips on him. And the feeling of his beard as well.
"You can do that again," Bilbo said, softly. "Whenever you like."
Then, feeling a bit bolder than before, he found himself leaning in toward Thorin, and placing a soft kiss against the Dwarf's lips. He did it without really thinking about it, all he knew was that he wanted to at least know how it felt to properly kiss him. Even if it only happened once.