Re: Gabriel + Dean + open = this is a mess guys
It was a testament to Castiel's actual level of dedication to his husband that he asked absolutely no questions whatsoever, and completely dropped the topic at hand. This was how it went: Dean Winchester before even himself, always. He knew absolutely that this (fireworks) was the thing that made Dean the most scared, uncomfortable, and he would deal with it as helpfully as he could.
Since they were already touching, it was a matter of less than a fraction of a second and the sound of wings before they were relocated to the basement: warm, soundproof, safe. Castiel said nothing, allowing Dean whatever time and space he might need to adjust.