Cerberus opened his eyes as he found himself in a place similar to the archon hall his Anemo counterpart had built. 

'Is this a dream?' The young man thought as he looked around, there was someone there with him, sleeping soundly wrapped in a white cloak that belonged to the archons. 

Long, Long time ago, there was a cradle,

Hearing the music and lyrics of the song, Cerberus' eyes widened as he saw the cloaked form of Anemo playing a tune from instruments made of Anemo constructs. 

And in the Cradle, there is another cradle,

Cerberus looked at the figure with snow-white hair with glowing silver eyes. The figure felt wrong, felt incomplete. As if it was separated into many pieces and he felt familiar. 

One cradle has become a twin now...

Wincing in pain, Cerberus opened his eyes and saw a figure, Anemo, looking at the Imaginary tree. His Anemo counterpart had managed to open a path to the imaginary tree.

And one of the cradles gets lost in the fog by itself

Cerberus's eyes widened as the form of Anemo shifted in front of him into a woman with white streaks appearing in her hair. Gently. Anemo (?) held the figure's hand and pressed it on his(her) cheek with a small smile on her face. 

A star is shining brightly in the sacred place

"Soon," Anemo(?) whispered as she turned around. One thing that the young man noticed was that she looked a lot like Fu Hua but with some of Reinhardt's features. "You finally reached this place," 

And disappeared

"He will wake soon," Anemo(?) whispered. Lightly, the young man let out an almost silent gasp. No, it was not Reinhardt's or Fu Hua's but his own. One mixed with his best friend?!

"Who..." 

"I am sorry for being harsh with you... father, but you will no longer be able to reach the Archon hall anymore," Anemo(?) said just as the Geo Archon fell. "Your 'contract' has been completed." 

For a moment, he saw the figure's dark white hair and silver eyes turn to the exact same shade as his before everything went dark. 

========

"Yatta!" Sentience cheered, bouncing happily as she enjoyed the foods served in Belobog. Stirring lightly, the former Archon shook the sleep off his mind. 

"Morning, sleepyhead," March said with a grin.

"shut up..." the young man said, sitting properly, before he noticed something, he was using Stelle as a pillow. "Sorry," 

"I don't mind," the calm and collected gray-haired beauty replied as she gave him a smile,

"What did I miss?" The young man asked, shaking his head as he felt the removal of his gnosis. His artificial one could only hold a fraction of what the original could. But he could use his Adeptus arts for compensation.  

"Oy! I'm heading back to the old-timer," Sentience said as she flickered out of existence before anyone can stop her. Shaking his head at his ancestor, the young man stretched slightly, enjoying how the cool air of Jarilo-VI soothed his mind. Feeling a presence in the crowd, the young man saw Seele, her hair dancing in the air as she moved. 

"So, how's your first trailblazing expedition?" March asked with a smile on her face. 

"Not bad, I got to stretch my limbs and all," the former Archon replied as he held his Serenitea pot tenderly. 

"Well, it's too bad that we didn't get enough time to look around," March whined, causing Dan Heng to chuckle a bit as he listened to music. "Speaking of which, where did you go when you were missing?" 

"I would like to know that as well," Stelle added, looking at the young man with stars in her eyes, the same way she looked at a trash can. 

"Sightseeing," the young man said, showing them numerous pictures of the places he had gone to. A picture of the young man smiling as he pointed a finger gun at the camera with the gigantic robot guardian in the background. Numerous Fragmentum monsters lay dead on the ground. 

"No fair!" March whined while Rex just smiled and patted her head, similar to how he used to rub Rin's head. Speaking of which, how was his beloved little sister? The young man watched how Stelle, frighteningly reminding him of his world's Bronya, raised his hand and land it on top of her head. It was adorable. 

"Well, we already finished everything we need to do," Dan Heng said. "Shall we return to the express?"

"It'll be a nice change of pace. Besides, I still need to talk with Uncle Welt," The young man said, causing the trio to look at him. "What is it?" 

"Mr. Welt is your uncle!?" March asked, holding the young man by his suit. 

"Uh, yeah. My family adopted his grandfather a century ago," Cerberus said. "He used to babysit me and he was a teacher of mine. Didn't I tell you this?"

"No," Stelle answered, looking at the young man curiously. "Then how did you arrive at the Space station?"

"No clue, all I remember was talking with Akavili and he brought me to the Space station," The  young man said. "Well, it was way better than what I was doing." Gently, the young man pulled out a card from his pocket and raised his brow as an ancient Shenzhou character appeared on it. 

"What's that card?" Dan Heng asked, eyeing the card and noticing how power resonated and flowed from the card. 

"A gift, to this world," Cerberus answered as he took his phone out. His fingers rapidly touched the screen as he wrote a message to a group chat that had Seele and Bronya in it. Closing his phone, the young hid it in his pocket. The group watched as the hand holding the card disappeared and reappeared a second later. 

===

Arriving at the astral express, the young man removed his blazer and his cape jacket. 

"Welcome back. You did well, you four." Himeko said with a smile making it hard for Cerberus to not do anything stupid.

'Damn it, don't tease her about being single! She has an orbital laser, unlike my world's version!" Cerberus thought. 

"Thankfully, that bad habit of yours is less prominent now, Cerberus," Welt said with a smile as he raised his glasses. "I was sure you would have tried to at least have committed a war crime or two," 

"Uncle Welt..." the young man whined. It was not his fault that war crimes made it easier for him to win. 

"It seems like you have managed to form another Serenitea pot. It's a shame that your first one is kept under guard by Kiana." Welt said causing Cerberus to raise a brow. Kiana had his Serenitea pot? "She only lets your brothers and your friends use it," 

"Does she let Reese in?" Welt's eyes widened as he looked at his adoptive nephew. He was sure he never told him about Reese. After all, Reese was born almost half a decade ago. 

"She... she does." 

"Reese is the successor I chose for a portion of my power," Cerberus said, as Himeko, Stelle, Dan Heng, and March listened intently. "Little shit found out a way to use my powers faster than I ever did." 

"Well, she is Mobius' daughter so it is not impossible for her to surpass you," Welt offered causing Cerberus to sigh. 

"Still can't believe he got her pregnant," Cerberus said, shivering as he remembered the harem wars for his oldest brother's heart. Hell, there was a time he hid inside a Geo shield construct in fear. 

"I thought she was the one you approved of the most?" 

"Well, it was a close tie between her and Big Sis Ely. Reve claimed his support for big sis Ely first," the young man said with a smile. 

"Speaking of Reve, your brother is married to Bianka and Rita." 

"That lucky asshole!" Cerberus growled out, causing Welt to smile at his nephew's outburst. "He has a harem and all I got is a stupid-ass uncomfortable stone chair," Himeko, March, Stelle, and Dan Heng recoiled at the sheer venom that oozed out of the young. "He didn't even invite me! He promised to make me his best man!" 

"Don't worry," Welt said, using his power of mimicry to show a book that has the name Rex Crozzo listed as the best man. 

"Good..." Cerberus said, sounding like a gremlin. 

"Uhm, Mr. Welt, who are Bianka and Rita? Who are Reve and Rein?" March asked, curious to know more about her Junior. Seeing his nephew now, Welt smiled.

"Who is Rex?" Stelle asked, curious at the sound of the name as she found that she liked how it sounded and rolled off her tongue. Welt and Cerberus' eyes met with the young man closing his eyes and nodding at the Herrscher. 

"Well, first thing first. Rex is him," Welt said, pointing at Cerberus who nodded at the group. The group looked at Cerberus in shock. "He used to fight against the endless hordes of the Honkai. They used to call him the Joyful Lord of the Earth," 

"Don't sell yourself short Uncle Welt. Even now, I would find it hard to beat you," Cerberus said with a smirk. "After all, didn't you once defeat a dimension-traveling Herrscher?" 

"It was a loss," 

"You almost killed her and interruptions of that bastard does not count," Cerberus said. "Reinhardt and Reve are my older brothers with Reinhardt being the older." 

"Why don't you use the name Rex anymore?" Stelle asked, looking at the young man in front of her. 

"Well, in a way, Rex Crozzo is dead," Cerberus said in a tone that meant he won't have any more answers to questions regarding his name. 

"What's with the teapot?" March asked, making Cerberus smirk as he opened the pot, chuckling as March was eaten by the small thing before being spat out through the spot. "That was awesome! I was just at a beautiful mountain range .

"This is a Serenitea pot. It's a pocket dimension that I made using Bronya's gift." 

"You know, if this keeps up, Kiana might kidnap you," Welt said, teasing his nephew as Stelle looked at Cerberus. 

"Who is Kiana?" Stelle asked, her golden eyes shining with a desire to find out about this Kiana person. 

"His ex-girlfriend," Welt said. 

"Kiana's not my ex nor did she become my girlfriend," Stelle let out a sigh of relief as she heard that. 

=======

Omake: Auntie Senti, 

Senti found herself back on Earth. She has crossed a lot of places for a long time. She even once met the young man with H/C hair that was her beloved nephew's successor for the position of the Geo Archon. He was kind of cute, not gonna lie. 

Maybe she can visit and mess with him once in a while. 

"I'm home!" Senti shouted as she entered the estate to see the Crozzo family with Mobius holding onto Reese. The scientist had mellowed out over the years. 

"Greatie Senti!" Reese shouted, smiling at the sight of her great aunt. Senti felt it. Throbbing inside the little girl was her own power of the Geo element. "Where were you?" 

"Reese, calm down," Mobius said, gently calming her daughter. "Sentience,"

"Hey, snake," Senti said with a smile. "Hello everyone! Awesome pops!" Sentience said to Ren, who was beside Fu Hua. "To answer your question, I was with Rex." 

The single revelation halted all the activities happening from Mei helping set the table with Rita to Reinhardt who was reading a book. The oldest Crozzo dropped his book as he looked at Sentience. He knew that she was a scammer but when it came to Rex (her self-proclaimed twin and favored descendant/nephew) she would never lie. 

"Really?! But mommy and daddy said that Uncle Rex was sleeping somewhere," Reese asked, innocently tilting her head. 

"fufu! Your uncle Rex was busy kicking butt!" Sentience said with a smile as she remembered how Cerberus moved and fought the Fragmentum monsters. "He's traveling with old boring Joa somewhere in space," 

"Alive..." Reinhardt whispered as tears of joy fell from his eyes. "R... Rex is alive," The father of Reese fell to his knees as a bright smile appeared on his face. His baby brother was alive and out of his seal! That was all that he needed.

"See! I told you!" Kiana shouted with a cheer, returning to how she acted when she was younger before blushing as she faked a cough to restore her dignity. 

"Well, he also has a cute girlfriend with him," A dark aura erupted from Kiana as she mechanically turned her head toward Senti while Mei's smile turned cold, causing both Carol and Adam (a member through adoption by Rin) to hug each other in fear. Bronya raised her brow as she shook her head while Seele sweatdropped when she saw how Bronya used her fork with more force than usual. 

"Rex!!!! You're not only back but with a girl-" 

"Do you want to die?!" Rin and Reve shouted, covering their older brother's mouth as Kallen giggled at how Reinhardt acted reminding her of when they were younger. The two looked at the scary Herrschers in fear. 

"Don't worry, Rein still has to give me a child so I'll protect him," Elysia said proudly. After all, she was Reinhardt's best friend and she won that right when Mobius challenged her. 

"Well, he was hiding from that place's Seele and Bronya. He made out with them according to March." 

Back in the Astral Express, the former Archon felt a chill run up his spine and decided to form anti-teleportation sigils around him.

======

Omake: Rex and his true love, war crimes. 

Cerberus paused as he heard the word Starnaught escape from Arlan's mouth as he argued with Asta. Asta was a cute girl but to find out that she had a fleet capable of space travel! Oh boy. 

"Here we go," Welt whispered as he saw the look on his nephew's face. 

Gently, the young man took Asta's arm and fell to a knee. at the same time, the young man formed a ring with a beautiful gem that matched her eyes. Seeing this, Asta turned red at the sight of Cerberus kneeling in front of her. 

Arlan and Peppy could only watch in shock along with the others as. 

"Will you marry me?" Cerberus asked, causing Asta to turn bright red. Hell, even Herta watched intently at the sight through the lenses of her robot body. "Grant me a fleet and for you, I will boil seas and let the stars fall. I will conquer countless worlds in your name. I will give you an empire to rule, legions to lead and protect, and anything that you ask for. I ask you again, will you marry me?" 

Asta turned even a brighter shade of red as she saw no sign of falsehood in the young man's eyes. What she saw instead was a passion that burnt as bright as the stars. Arlan looked impressed as he looked at the young man, finding him to be a suitable role model. 

"I will burn the galaxy for you if you so desire," Asta panted heavily as she looked at the young man, her eyes rapidly showing how her mind worked at a fast pace. "Will you be mine?" 

 Herta analyzed the possible results that such a thing will entail and found a lot more benefits than risks that it will pose to her. Stelle, beside Welt, wordlessly flexed her baseball bat, causing March to stay away from her. Welt let out a chuckle as he watched what would happen next after all, Cerberus committed more war crimes, both in games (mostly) and in real life, than romantic deeds.

'He probably remembered how he used to play Warhammer and decided to conquer the universe to prove a point.'

==========================================

Ah yes, Reese's mother is finally revealed and what is this?! Anemo is a girl that looked like a fusion of Rex and Kiana. 

Also, Y/N x Senti? 

Seems like Stelle is getting interested in our boy Cerberus/Rex, 

I wonder what will happen next. 

Fun Fact: 
During Apho, Adam and the others faced a corrupted Sky people construct of Rex. 

Let's say that Bronya was pissed when that happened. 

Also, I got Seele. 

Another fun Fact: 

If Rex is in Teyvat, he would most likely be roaming Sumeru, Liyue, and/or Monstadt all the time. 

He would flirt with Yan Fei the most if he is in Liyue and would probably end up being mistaken as Zhongli by everyone that knows the guy. 

Sneak peek: 

Cerberus found himself enjoying a cup of tea as he sat on a stool in front of the counter while he effortlessly blended in with the natives of Xianzhou Luofu. The former Archon enjoyed the blissful air beside a man as they ate their meals. 

"Want some?" Cerberus asked, offering the man beside him a meat bun. 

"Thank you," the man said with a smile, taking the bun gently as the two ate in blissful silence. The dozing general was blissfully unaware that the young man beside him would literally cause war crimes, intentionally or not.