The Way it Should be by mabelreid on Fanfiction.net
A/n this is what I think would have happened at the end of "Amplification" if JJ had a child with Reid. I think it explains her attitude during the episode better then that she was just so concerned for Henry when it was Reid who was sick. Obviously it's AU and there are spoilers.
She jerked awake when someone tapped her on the shoulder. “Ow…” Her neck hurt from sleeping with her head to one side in a very uncomfortable chair.
The girl standing in front of her had red hair, freckles and silver wire rimmed glasses. “Hi Mrs. Reid,” The girl said softly.
“Oh, hello Grace,” She wiped her hand over her eyes that were grainy and hot from too little rest.
“I brought Jason like you asked.”
The nineteen-year-old college student, who was also their live in nanny stood aside to reveal the little boy in the stroller next to her.