Well. It's like this. I have recently started wearing braces, and have childhood experience with braces as well, so I can pretty much tell you. The very first day in braces they don't hurt as much and you don't feel as sensitive as the second and third day. The second day is the worst. The first day it's more about being a little uncomfortable, it's like your teeth feel, hmm, thicker,  that you can't seem to move your lips as fast and easily as you normally do, and THIS is what you experience while kissing someone on the day you got your braces.

For me now it's almost the same to kissing without braces, but sometimes I can't help feeling a little aprehensive on whether I may be hurting her with my brackets, or about salivating a lot; and now, well, doesn't really "feel" pleasant or unpleasant but  you sometimes feel when your brackets touching her, as you can feel the pressure but not the touch. Sometimes you feel very braces-conscious (like when it's the first time you kiss someone with your braces on) but you end up getting used to it.

The first day it was indeed weird for me and my wife, but it was mostly because I felt clumsy with my braces, and she was trying not to hurt me, and I was trying not to hurt ber. But that's not about the actual physical feeling. My answer, so, would be: "I dont know, a little weird, a little clumsy, but it seems like I will soon adjust".