So, while I did answer your question about temperature scale, a further clarification that sometimes American references will continue to occur. Asking questions is okay if clarification is needed but some things cannot be changed because of my own background. I'm generally open to adding or adjusting things but some things are what they are because of my being American. Speaking of additions, this is a big chapter. Back on January 14th/15th you asked me if I could add Teddy, Victoire, and a Metamorphmagus child and I said I would. This is the chapter in which they first appear. Their first appearance is a meeting with the Potters. I apologize for how long it took for me to do this after saying that I would.
On Monday, August 2nd, 2021, Harry, Ginny, James, Albus, and Lily were in the living room sitting on a white Ashley Furniture sofa, which had been magically expanded to seat ten people that could all sit six feet apart from each other as the Potters were expecting guests that day.
A few minutes and a few nanoseconds after one in the afternoon, they heard the sound of people flooing in.
Next thing they knew, Harry, Ginny, James, Albus, and Lily had been joined on the sofa by Harry's godson, Teddy Lupin, Teddy's wife, Victoire Weasley, Teddy's and Victoire's twin three year old son and daughter Remus and Dora, and the Potter's family friend, Luna Lovegood.
Teddy, Remus, and Dora were all Metamorphmaguses, meaning that they had the ability to change their appearance at will.
Teddy and Remus appeared with black hair and Dora appeared with silvery blonde hair.
"Hi, " warmly chroused Harry, Ginny, James, Albus, and Lily to Teddy, Victoire, Remus, Dora, and Luna.
"Hi, " replied Teddy, Victoire, Remus, Dora, and Luna with equal warmth in their voices.
"Hey, Teddy?" Harry asked his godson, "Are Remus and Dora Metamorphmaguses too?"
"Yes, " said Teddy proudly.
Teddy gave his son and daughter a meaningful look and in an instant, Teddy, Remus, and Dora were all wearing turquoise hair.
"Oh, how cute!" cooed Lily.
"That's so cool!" piped up James giddily.
"Awesome!" said Albus admiringly.
"Teddy believes that the Metamorphmagus trait is hereditary, " explained Victoire.
"That means sense, " said Harry thoughtfully, "Tonks passed the trait onto Teddy, who has now passed it on to Remus and Dora."
"Hey, Victoire?" asked Ginny, "Do you ever feel jealous that your husband, son, and daughter are all Metamorphmaguses and you're not?"
"Not at all, " smiled Victoire, "In fact, I had been hoping all along that Remus and Dora would inherit that trait from Teddy. It's so much fun!"
"You're part veela, " aren't you?" Luna asked Victoire.
"Yes, " confirmed Victoire, "My mom's maternal grandmother, my great grandmother was veela. My mom is part veela and passed that on to me. Dora is also now part veela as the trait passes down the female line."
Teddy, Remus, and Dora all now changed their hair to a vivid lime green.
"Ooh, nice, " beamed Lily jovially.
"That's bloody brilliant!" grinned James.
"Can you do orange?" requested Albus.
In response, Teddy, Remus, and Dora all turned their hair orange.
"WOW! cried Albus.
"Metamorphmaguses are the coolest thing ever!" said James glowingly.
"They're so cute, especially the kids, " cooed Lily.
Remus and Dora had grins come across their small faces and beamed at Lily, who beamed back.
"Hey, Harry, " said Teddy seriously, "I know I've said this before, but it bears repeating: Harry, I know you liked my father very much. I would like to thank you for NOT using the name Remus for either of your sons."
"I said all along that only you should have the right to use that name and that I was saving that name for you to use for your own son, " said Harry firmly.
"I really appreciate that, Harry, " said Teddy sincerely, "I always knew that if I ever had a son, I was naming him Remus. And even though I know my mom didn't like her full name, when I knew I was having a daughter, I thought Dora sounded like a nice tribute. "
"Teddy, " said Luna, smiling at him. "That's a wonderful tribute on for you to name your twin son and daughter after your late mother and father."
"Thanks, Luna, " said Teddy sincerely.
"Did you ever consider naming your daughter Tonks?" Harry asked Teddy curiously.
"I did, " admitted Teddy, "But I thought Tonks sounded awkward as a first name. I liked how Dora sounded a lot better, so I went with it."
"Hey, Luna?" asked Harry kindly, "What have you been up to lately?"
"Traveling the world seeking to discover new creatures, " said Luna dreamily, "But you'll have to wait for the next edition of the Quibbler to know what new species I've discovered!"
"We're still subscribed, " Harry assured her.
Luna beamed at Harry.
Lily, meanwhile, was looking over at Remus and Dora. While they seemed to enjoy showing off their being Metamorphmaguses. it occurred to Lily that neither of them had spoken. Clearly, both Remus and Dora had a shy side.
Lily didn't blame them. It had to be a little uncomfortable being a little kid surrounded by people bigger and older than you. And apart from their parents. Remus and Dora were seeing/meeting everyone here for the first time.
Hoping she could get them to open up a bit, Lily said, "Hey, Remus, Dora, my name is Lily."
"Lily, " replied Remus and Dora in quiet but warm voices.
"I know it can be a little scary meeting new people for the first time, " Lily told Remus and Dora reassuringly, "But everybody here is nice. Everybody in this room will treat you well."
"Who is who here?" asked Remus, sounding a little more confident.
"I'm Lily's brother, Albus, " offered Albus.
"Albus, " replied Remus and Dora in warm and more confident voices.
"I'm Lily's and Albus's other brother, James, " James introduced himself.
"James, " answered Remus and Dora in warm voices that sounded their most comfortable yet.
"James is seventeen, Albus is fifteen, and I'm thirteen, " explained Lily, "You're both three, right?"
"We're three!" chorused Remus and Dora happily.
"Hey, James, " interjected Luna, "Let me be the latest to congratulate you on becoming Professor Potter!"
"Yes, congratulations, Professor Potter!" agreed Teddy and Victoire.
James beamed and took turns smiling at Teddy, Victoire, and Luna.
"Thanks, " said James glowingly, "Being called Professor Potter warms my insides every time I hear it. But, Luna, how did you find out about my being Hogwarts Wandmaking teacher if you were out of the country?"
"Some news just spreads around the world, " said Luna dreamily as she now was staring at the ceiling.
"I still wish you would have gone into Hufflepuff," Teddy told James.
"I'm a great bold wizard, I belong in Gryffindor, " said James proudly, "Besides, I'm glad all Potters are or were Gryffindor."
"Hear hear!" agreed Harry, Ginny, Albus, and Lily.
Teddy, Remus, and Dora now turned their hair sun yellow.
"Nice and sunny!" said an awestruck Lily.
"Bright and perfect!" said James radiantly.
"Totally warm looking!" added Albus.
"Hey, James, " piped up Teddy, "May I give you some advice on your N.E.W.T. year?"
"Sure, " answered James, "Since you've been through that year yourself, why shouldn't I listen to what you have to say?"
"Here's the deal, " said Teddy clearly, "It's especially important that you not stress yourself out too much. I'd like to offer you some advice on dealing with potential stress in N.E.W.T. year."
"You know, " offered Albus, "I'm going into my O.W.L. year and James himself has offered me advice on how to handle it."
"What kind of advice did he give you?" inquired Teddy.
"He told me to focus on what I actually needed to learn and to not think about or focus on the stakes too much. He also advised me to approach my O.W.L.s in a manner that focuses on applying what I know and have learned, again, without thinking too much about the stakes, " explained Albus.
"If you think too much about what's on the line, you'll put too much pressure on yourself and collapse under its weight, " said James in a businesslike voice, "The best approach is keep your mind focused on the actual learning and then on the actual application of what you have learned."
"Wise advice, James, " said Teddy approvingly, "Maybe you don't need my advice after all. Still, I had problems with stress early in my N.E.W.T. year. My solution? Leisurely reading."
"What do you mean by leisurely reading?" asked James.
"I started a thing where every night before bed, I would read at least one chapter from a non-academic book. It could be a leisurely subject like sports or music or it could be a story. For me, I starting reading a lot of fantasy novels. I would read a chapter or two from a story every night and lose myself within the story's world. That really helped me to relax before bed. This relaxation also led to me getting better sleep, resulting in my being fresher and happier in the morning, " said Teddy a crisp and clear voice.
"That's a fantastic idea, " said James cheerfully, "Before Hogwarts next semester starts, could you send me a list of books you'd recommend reading for leisure?"
"Of course, I will, " promised Teddy with a genuine smile.
"Could you send me the list as well?" asked Albus, "I'm more high strung than James and even O.W.L. year could cause me stress issues."
"Absolutely!" agreed Teddy immediately, "Lily would you be interested in receiving the list as well?"
"Yes, " said Lily gratefully, "I'm going to have a busy year myself, so doing more leisurely reading would be good for me as well."
Next nanosecond, Teddy, Remus, and Dora all turned their hair Lily's favorite tent of hot pink.
"Thanks, " said Lily glowingly.
"Hard to believe even she's a teenager now, " said Luna quietly, "And, Harry, to this day, I'm still very touched that you named your daughter after me."
"You deserved to be honored, " Harry told Luna sincerely, "And Lily Luna Potter has a nice ring to it."
After that, time passed with the adults and teenagers on the couch chatting while Remus and Dora entertained them with frequent hair color changes.
As time to leave approached, Teddy, Remus, and Dora paid tribute to everyone present.
Teddy, Remus, and Dora, in quick succession, turned their hair the exact color to match Luna's, Harry's, Ginny's, James's, Albus's, and Lily's, receiving a silent but content and happy smile from each of them in turn.
Finally, Teddy, Remus, and Dora all changed their hair to match the exact shade of Victoire's silvery blonde hair so that they all rose from the sofa with the same appearance.
Waving back at the Potters and Luna, Teddy, Victoire, Remus, and Dora all walked over to fireplace and vanished.
Then, Luna, waving at the Potters herself, got up off the sofa and went home as well.
The five Potters were left sitting on the couch, thoroughly happy to have received the visits from Teddy, Victoire, Remus, Dora, and Luna.