AU where Sirius is with Lily when her water breaks and they can't get ahold of James and Sirius is panicking and running around breathing heavily trying to get himself together because his best friend's wife is going into labor right before his eyes and meanwhile Lily is waiting at the front door with her bag and a slight smirk on her face.
After like 20 minutes of "DID I PACK YOUR TOOT BRUSH? DID I PACK MY/JAMES'/THE BABY'S TOOTH BRUSH?? OH WAIT, THE BABY WON'T HAVE TEETH" Lily finally is like "Get a fucking move on you nerd"
At one point he yells "I'M NOT READY TO BE A FATHER" and Lily is like "Sirius, this isn't your baby"
And he goes "PUH-PLEASE LILY THIS IS EVERYONE'S BABY"
