Bobby John (or Jeremial, if Cas is in the room) is just like any other baby: cries when he's hungry; smiles when he's happy; makes adorable pouty faces when he wants something just out of reach.
Unlike normal babies, however, he's got a giant pair of wings on his back.
"They are relative to his size," Cas always insists, but Dean doesn't believe him. They're two times his length, and have personalities of their own. They flap and quiver, bat and shake, and tend to knock into every stack of books in the bat cave. And somewhere along the line, Bobby John decided to skip the whole "crawling" stage, and just went to the "fly at Daddy's face when we see him!" stage.
Dean would find it cute if he wasn't bowled over by 15 pounds of baby every time he returned from a long hunt.
"Wait until he learns how to teleport," Cas warns, and Dean has to smile through gritted teeth.
"Awesome."