Bilbo was fully aware of how his words could be taken. He found that he wanted them to be taken a certain way as well. He knew that it could potentially change the relationship he had with Thorin, and possibly not for the better. But he also knew he needed to tell the Dwarf how he felt. It wasn't fair to Thorin not to.
He arched an eyebrow at Thorin's words. He considered this for a moment. Did Thorin mean what he said in the same way Bilbo had? He wasn't exactly sure. Perhaps Thorin had only meant he didn't want to live with anyone other than him.
So he leaned in and placed a quick kiss on the Dwarf's cheek. As though to indicate what he had meant.