Now you can do the things you've always done as friends and things people do as more than friends.
While you'll want to spend the whole day together, there are other people in your life who need your lovin' too, like family and the rest of your buddies. If you've always made fun of his obsession with that one childish video game and he's always picked on you for wearing that "weird" man-repelling top, it's not going to stop now.
The only difference is that the teasing will probably end with a kiss on the forehead instead of a playful punch in the arm. If you're fighting with him or her, you might have to tap your mom or another friend for advice.
You try not to think about what would happen if this all doesn't work out, but sometimes you do, and sometimes a mighty pang of anxiety comes along with it.
But you're comfortable enough to laugh at the fact that, yes, it's happening now, and it feels pretty wild.
But after you've been intimate a few times, the giggling will subside, the romance will kick in, and the sex will probably be pretty darn good. At first, you won't be able to get enough of each other.