Harry was so adorable and Sirius loved every moment he spent with his little cub. I mean Remus did leave him alone in Their flat for a couple of hours to run some errands. So That gave Sirius the idea to try to get Harry call him Papa instead of Padfoot well pafoo in Harry's words . So that is how Sirius ended up on the floor in the living room with his cub sitting in front of him.
"Come on, pup , you can do it , say papa "
"pafoo"
"What? Harry sweetheart , no. say Papa" Sirius repeated
"pafoo"
Sirius pouted, Because Harry was being a suborned little pronglet just like James was also so stubborn when it come to things. Sirius sighed and crossed his arms giving Harry a playful look because Moony says he can't glare at the baby " Is there a reason you little Pronglet are a little shit?"
yeah that wasn't really a good idea to curse. Why? two reasons really , first being Harry is 2 which means he's in the phase of repeating everything and anything he can copy words or sounds from. and the second being Remus was going to bloody murder him when he gets home , when he hears Harry curse
"Shwt!"
"shit no , no Harry cub , Don't say that."
"Shwt!"
"Harry , Listen to Papa , that's a no no word "
"Shwt! Shwt! Shwt!"
"Fuck, Harry! Don't say that! ," Sirius started to panicked because he's sure if James and Lily were here hearing this , Lilly would be both laugh at him and hexing him , and James? Oh he would help Remus kill him , hell probably even hide his body. Harry smiled at Sirius and Sirius swore he could see the mischief in his cub's little eyes. In that moment Sirius knew he fucked up, Yeah Remus is definitely going to bloody murder him now. So Sirius said in a oh so slowly and calm yet pleading tone
"Wait...Harry, Pronglet , Sweetheart , cub , please don't copy Papa"
"Fwck!"
There was silence for a few moments as Sirius accepted his fate , He really did, Because when He heard the keys jiggle in the door , He knew he was fucked . As soon as Remus got the door unlocked and opened. Remus just smiled at the two on the floor not knowing he was about to be pissed in a few seconds. Sirius knew would be sleeping on the couch for a week or maybe more. So like a good husband that knew he was about to get in trouble , Sirius ducked his head down looking at the floor slightly. Just as Remus bent down to pick up Harry from the floor and settle the their little pup on his hip.
"oh daddy missed you so , did you learn anything with papa? "
"Fwck shwt!"
Remus' eyes widened, just as his smiles dropped and looked at his mate then back at Harry. So in calm tone he asked their son.
"And Who taught you that? Hmm? Because that's a no no word pup"
"Papa!"
".....Oh! so know you wanna sa-"
"SIRIUS ORION BLACK-LUPIN"
yep He's sleeping on the couch