The laughter just sort of faded off, a little at a time.
Then, when their laughter faded, they found other things to share.
As he looked down at her, though, his laughter faded.
The laughter faded, and they were finally listening to him.
Then the laughter faded, and she turned to face them both, fully.
The laughter faded as I looked into his worried eyes.
Laughter faded from the eyes of the man opposite him.
Then the laughter faded and she took on a very serious attitude.
That made the laughter fade, and the smile went with it.
The laughter faded behind him, but there would always be tomorrow and the day after that.