The Potters
Being squeezed via portkey through space always upset Jacob's stomach and he started whining again almost immediately upon landing. The temperature had noticeably dropped a few degrees out in Godric's Hollow, as though winter had already come to the country. Lupin tried to soothe Jacob as Sirius bounded up the walkway to bang on the door.
"Open up, Prongs" Sirius barked, "you've got company."
The door flung open and Sirius' face broke out in the goofy grin he reserved only for James. The two men embraced as if entirely alone, while Lupin, holding Jacob, skulked up behind them, and let out something in-between a cough and a grunt. Startled, they jumped apart.
James turned to Lupin, and clapped him on the back. "How've ya been, Moony?"
"As well as one might hope these days, thanks. I hope you and Lily have been getting on alright?"
"I can't tell you how much Jacob's been looking forward to this, innit right, Jake?" Sirius interjected. Jacob shot him a nasty look before storming past James, into the living room. Lupin sulked inside after him, while Sirius rolled his eyes and chuckled.
Once inside, Lupin greeted Lily with a kiss on the cheek before bending down to tickle Harry.
"What's he wearing, daddy?" Jacob demanded.
"That's his Halloween costume," offered James, stepping up behind him.
"So he's some sort of bloody fairy?" Jacob pulled at the cape attached to Harry's costume.
"It's called a vampire," said Lily sweetly.
"Vampire's are sposta be scary, Harry's just an ugly, glittery baby," Jacob whined, turning away to go play with his car. Lupin glared at Sirius who seemed altogether overly amused by his son's moods.
"Sears, c'mere a minute." James nodded toward the basement. "I want you to see this new Quidditch simulation I've been working on."
"Catch you in a few, Remus," Sirius called, tagging along after James.
Lupin was so intently fixated on the place where they'd vanished, that he barely registered Lily's casual, "Those boys and their Quidditch."
"Yes", he agreed, through gritted teeth.
Lily went over and scooped up Harry, who was busy sucking on his already puckered vampire cape. She brought him over to the couch where Lupin had still not moved, and after noticing the look on his face, took to singing softly to Harry, who rocked back and forth on her lap.
Lupin suddenly jumped up. "Who do they think they're kidding?"
Startled, Harry started crying. "Oh Remus, now look what you've done! It's been over ten years. You two are married now. I trust that James is perfectly content with me, can't you do the same?"
Lupin turned away. "Forgive me, I don't think we'll be able to stay as long as we'd originally intended."
"This is ridiculous. He's your best friend, too. We haven't seen you since July. You've been here all of five minutes. Stay for dinner, at least."
"I just—I'm sorry." Lupin threw open the basement door. "Sirius!"
"What is it, dear?" Sirius' exasperated voice floated up from the basement.
"I need to speak to you!" Lupin waited for any response before adding, "now!"
"Alright! I'm coming!" Sirius stomped up the steps and into the entryway. "Now. What is it?"
"We need to leave. There's… something I forgot to do, I mean, I… left the cauldron on?" Lupin finished, lamely.
"Look, I know what this is about. You're welcome to come join us, it's just you've never expressed much of an interest in Quidditch before and well… it's always been our thing…"
"No, listen. The thing is, I forgot to take my potion tonight, and it's nearly a full moon. What if I were to transform over dinner?"
"Remus, it's a new moon tonight. Really, it isn't fair to me or James for you to behave like this every time we go over to the Potters. Now, if you really feel you need to leave, leave. Take our son with you, since you're both such unpleasant company tonight. You'll be sorely missed. But I'm gonna stay."
Stunned, Lupin turned, and without another word, gathered up Jacob and left, slamming the front door behind him.