This story will be my efforts at writing decent Newtina fluffiness. So far, I have only seen the first Fantastic Beasts movie, so if these bits 'n pieces don't match up with later canon, that's why.
Hope you like it!
. . .
Unknown to Newt, Tina would sing the Ilvermorny song to their child before bedtime.
Unknown to Tina, Newt would sing the Hogwarts song to their child when Mummy wasn't around.
When the child came past them one day, pulling a toy for the Kneazle and singing,
"Hoggy hoggy 'chusetts,
We choo-choo scabby knees,
Your walls are full of castle fluff and air,
Your days are brains all rot and dream",
Newt and Tina both paused mid-sip of cocoa to stare in unison, first at the oblivious child, and then at each other.
Tina was the first to start laughing.
. . .