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Sirius was watching Harry while Lily and James went Christmas shopping for Regulus. Sirius had set out some markers and paper for Harry to draw while he made lunch. He flipped the knob on the stove off and called out to Harry.
“What are you drawing pup?”
“Papa.”
Sirius put the cheese toastie he just made on a plate and cut it into fourths the way he knows Harry likes. He walked to the table and set the plate down with Harry’s juice cup. Now that he was closer and could see what the kid was drawing he was confused.
“Hey prongslet I love your drawing but...is that a cat?”
Harry nodded with all the enthusiasm a five-year-old is capable of.
Sirius's brow furrowed, “I thought you were drawing your Papa.”
Harry frowned. “I did draw Papa.” He pointed at the paper.
“Since when is he a cat?”
Harry’s eyes went wide and he lowered his head then sniffled. Sirius dropped down in front of his seat concerned.
“Woah what's the matter bud?” He asked running his hand through the top of Harry's wild hair.
“I spilled the peas.” He said frowning.
Sirius turned his head to hide his smile. “Do you mean you spilled the beans?”
Harry furrowed his brow. “No, the peas..beans would be silly Paddy.”
Sirius nodded as if that made sense to anyone other than Harry.
“Well, what do you mean you spilled them? About what?”
“Papa’s chwistmas present. Hims a kitty cat.”
“Regulus is becoming an animagus?” Sirius smiled to himself. He knew James had wanted Reggie to become one for a while now.
Harry nodded. “But it's a super secret surprise.” He got teary again, “Until I ruined.”
Sirius wrapped him in a hug soothing him. He rubbed a hand up and down his back calmingly.
He pulled back and wiped a fallen tear away before speaking, “Hey it's okay. I can keep a secret I promise.”
“Moony promise.” Harry held out his pinky. Remus had been the one to teach Harry what a pinky promise was a few weeks ago and Harry refused to call them anything other than ‘Moony Promises’. Sirius smiled and linked their pinkies.
“Yeah, Harry I Moony promise.”