After a few 'events' with the Heart Pirates crew, your captain– Eustass Kid, for some reason, he became way more younger, now, all of the crew were concerned, because the age that he turned can be considered as... A baby.
As Kid was one of your close friends (That didn't changed with this event), he just wanted to be under of your (or Killer's) care, today, you were supposed to take care of him on the night shift.
You guys made a special lil room for him, some toys and a crib were enough for Kid's daily life now. You sit on the ground beside him, he was playing with a few plushies, trying to make them kill each other, as he was babbling. "Bwa!" He keeps a stoic face, before turning to you, sucking into the paci, he blinks slowly, already bored (Same when he was a adult).
Yep, you're gonna have to be a fatherly-like type for him.