Disclaimer: I own nothing.
Just a short oneshot.
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When the BAU team discovers a young girl named Amaera hiding in a closet at the latest crime scene, they realise that she is a material witness who may have seen the UnSub.
They take her back to the station, but the young girl is not saying a lot. She's shyly holding onto Morgan's hand as she looks around fearfully at the people around her. When Amaera tugs on his hand, Morgan lowers himself to her level as she whispers loudly into his ear. 'I want pigtails!'
Without a word, everyone turns to Hotch – he's the one with a daughter!
Ten minutes later finds the team observing Hotch as he dutifully brushes Amaera's hair, parts it, and ties two pony tails, before setting about plaiting them. As the child stands between his knees, Hotch's carefully worded questions extract information about what she'd seen and experienced that day, as the team listens carefully at a distance.
They get some very useful information from Amaera, including the fact that there were two people in the room – one black man who was bald, and a white man who had a limp – but the greatest sight of all was seeing Hotch doing Amaera's pigtails, as it was so very un-Agent Hotchner.
One local law enforcement officer joked that knowing how to do pigtails is now a requirement to enter the BAU, as Rossi and Morgan laugh at their boss's expense. Seeing it as an affront on his much loved mentor, Reid took it upon himself to reel off statistics about the involvement of fathers in their children's lives, before declaring that Hotch was one of a dying breed!