I don't own Harry Potter and likely never will.
The next day was pandemonium. James had not slept well, his sleep filled with nightmares of Sirius in Azkaban with only James' own dead body for company, Remus wandering empty fields alone, and high-pitched laughter he still remembered from the night he 'died.' Lily ended up having to wake him up in the morning, so as to take Harry and the others to the train station, and he could count on one hand how many times that had happened.
What followed was a lot of people running around, a lot of yelling, and way too much mayhem. Mrs. Black started shouting at some point, but everyone was so busy, and there was so much noise that no one bothered to try and get her to shut up. Then Fred and George bewitched their trunks to fly down the stairs and accidentally knocked Ginny down two flights of them. While Molly was patching her up and yelling at her sons, Moody insisted that they couldn't leave until Sturgis arrived.
Finally, everyone who was going was downstairs and giving their luggage to Moody, who was going to deal with them.
"Oh, for heavens sake, Sirius, Dumbledore said no!" Molly yelled, as a huge black dog appeared between James and Harry.
"Come on, Molly," James protested, "It's a crowded train station. What's going to happen?" After what had happened last night, James was more than eager for Sirius to get outside, even for a short time.
"Oh, honestly, well, on your own head be it!"
And then the Potter's and Sirius were outside. They met Tonks and headed toward the train station, while Sirius scared pigeons and chased his own tail. Then, they were at the station, meeting up with the others, and then it was time to say goodbye.
"Good luck," said Lily, hugging Harry, "Stay out of trouble. Try not to get into anything dangerous."
"Be prepared," James said, "With what the Prophet's going on about, some people might believe them. Don't let it bother you."
"Look after yourselves," Remus said, "All of you. Be careful."
"Yeah, keep your head down and your eyes peeled," said Moody, "And don't forget, all of you, careful what you put in writing. When in doubt, don't put it in a letter at all."
Lily and James glanced at each other. If anything like what happened the last four years happened, Harry wouldn't be able to tell them about it.
"It's been great meeting you all," said Tonks, "We'll see you soon, I expect."
The train whistle sounded. "Quick, quick," Molly cried, hugging everyone, "Write, be good, if you've forgotten anything we'll send it on."
"Goodbye," Lily said, hugging Harry again, and then the rest of them. "Love you."
James hugged his son as well. "Stay safe."
Sirius reared onto his hindlegs and put his front paws on Harry's shoulders. Then Molly shoved Harry towards the train, hissing "For heavens sake, act more like a dog, Sirius."
"See you," Harry called from the train, as he and the others waved from the window. Sirius bounded after the train, barking, until it rounded the bend, and Harry vanished.
Sirius came back more slowly, tail drooping, and sat down next to James. "He'll be alright," James said, rubbing the dog's ears.
It had been a few weeks since school started. Letters from Harry had been formal with absolutely zero information. Lily was sure their letters were the same, and it was annoying, but it couldn't be helped. Still, Harry had managed to send some information in his letter to Sirius, which he was currently answering. Lily had purposefully timed her visit to Headquarters, so she could get news on her son. James was on guard duty.
Clearly, it had taken longer for Sirius to get a hold of the trio than he had hoped, for his head was still in the fire when Lily entered the room, and she caught the tail end of the conversation. "...less like your father than I thought. The risk is what would make it fun for James."
Lily thought it was easy to figure out what was going on. Sirius, who had been driving himself mad moping around the house, had offered to go to Hogsmeade as Padfoot, and Harry, having probably seen the Prophet, had refused.
"Well, I'd better get going. I can hear Kreacher coming down the stairs," Sirius continued, "I'll write to tell you a time I can make it back into the fire, then, shall I? If you can stand to risk it?" He pulled his head from the fire and it died with a pop.
Lily crossed her arms and set her expression to one of disapproval.
"What?" Sirius asked, defensively.
"That really was uncalled for," Lily said, coolly.
Sirius made an impatient gesture and started to leave the room. Lily stepped in front of the door.
"He's just trying to keep you safe," Lily said, "The Ministry knows that you're in London. Hogsmeade isn't a crowded train station. It's dangerous."
"Yeah, well, it's dangerous to shut me up here," Sirius growled back, "I've got to get out of this house before it drives me mad!"
"You were out," Lily pointed out, "Not that long ago. And you survived multiple months in here before that. At least let Kingsley convince everyone you're not in London before you start taking risks."
Sirius stamped around the room, aggravated. Lily came in and sat down.
"So, what did Harry have to say?"
Sirius continued to pace the room, but halfway through his update he calmed down enough to join her at the table. Remus and James arrived later, and Sirius seemed more cheerful among all his old friends. Still, Lily hoped Voldemort would come out of hiding soon, before Sirius did something rash.