Aight so the requests won't connect to the main reaction and will be different with solo Fandoms. This one is for angry_lumine hope you enjoy ;)
And in this Y/N is ???   

Update: Oh and sorry for not posting yesterday. I had the chapter ready to be posted but I had work to do and when I came back I passed out as soon as I layed down. On the couch.

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Our scene opens to a familiar theater where in a flash of lightning many people appeared AKA Genshin Cast, except one person. (No genderbends)

Paimon: Whoa! Where are we?

Shinobu: *hits Itto on the head* I told you not to touch that crystal! Now look at what you did.

Itto: I'm sorry. I was just curious.

Lumine: *stands up and looks at everybody* Doesn't matter. Let's see who we have in here, when I say your element raise your hands. Geo!

7 raised hands

Lumine: Cryo!

9 raised hands

Lumine: Electro!

9 raised hands

Lumine: Ameno!

7 raised hands

Lumine: Hydro!

7 raised hands

Lumine: And Pyro!

9 raised hands. Wait. 9?

Lumine: Someone's missing with pyro vision.

Jean: Wait where's master Diluc?

Kaeya: Oh? I don't see Y/N anywhere.

Just then a small note appeared in front of Lumine and she read it out loud.

Lumine: "Hello people, you're here today to watch about your friend Y/N, or Diluc as you call him. More specifically about his big secret. Oh and Lumine, you might enjoy this" *note dissappears* Huh, well that's that.

Just then the screed turned on and Lumine sat down.

Klee: Oh it's starting!

On the screen they could see a cleanly organized office and Y/N standing looking out of the window into a starry night.

Gorou: It's night? But I swear it was day when we got here.

Lisa: Maybe time works different in here.

Y/N: *sees a full moon* It's time.

He walked away from the window and into the center of his office. He stood on a big carpet in the center as he slightly spread out his hands and a burning circle appeared on the carpet.

Bennett: What the?

Klee: Whoa! It looks so cool!

Xinyan: I agree!

The circle started to glow brightly as everything in his office started to melt and catch on fire, however to everyone's surprise the fire didn't spread outside of the room. Soon after the circle disappeared and Y/N was covered in fire which soon dissappeared and his appearance changed. His eyes now became fiery red and fire was coming out of edges of his eyes (like Raven's maiden powers from RWBY) his hair grew longer as well and was now reaching his lower back. The hair itself was strange as the lower it went it was replaced by fire which acted like hair. (Hair till shoulders, from there slowly turning orange and from middle back it's fire) The female part of the audience blushed not just because of his new looks but also because he was shirtless and because of how ripped he was. His hands were glowing and starting from the waist his legs were fully engulfed by fire but at the bottom they looked more draconic like. (This is how the hands are glowing. Couldn't find any pics for the rest. Sorry)

Y/N: *Inhale* *exhale* It's good to be back.

Paimon: WHOA! Master Dilic looks so cool!

Zhongli: 'What is this aura? It feels so, devine, so, familiar. Can he be? No it can't be, they can only be female'

Jean: *blushing hard* I-I didn't know Y/N was so muscular.

Lisa: Oh, does Jean has a crush~?

Jean: W-what?! No!

Lisa: Then you don't mind if I take him for myself?

Jean: Lisa!

Rosaria: Everyone SHUT UP!

Y/N: Hmmm, oh? What is this? Another divine aura? But it's, small. Let's see who it belongs too.

A portal made out of fire opened next to him and he walked in as the place changed to a very familiar place for someone.

Lumine: 'He can go there!?'

Y/N: Well this looks nice.

He started walking along the path as it built itself for him and destroyed behind him. After a bit walking he came across a white haired woman with her back turned to him.

Y/N: 'you look familiar'

Lumine: *angry* 'unknown god'

Y/N: Well hello.

The woman turned to Y/N and looked at him with a glare.

Meanwhile Y/N mind: (only a first 5 seconds)

Y/N: Sirin?

Genshin cast(- Zhongli): Who's Sirin?

Zhongli: 'no, it can't be!'

UG(unknown god): You dare to step into this sacred place?! Then die.

She launched a lot of cubes at Y/N who just stood there and looked at her.

Y/N: 'nope, you're not Sirin. Her attacks are more powerful'

The attack hit him head on which caused a big explosion.

Jean/Barbara/Amber/Kaeya: Y/N!

UG: Hmph. Weak.

She started to walk away but from the smoke a beam of fire hit her in the back and she stumbled and almost fell down. She turned around to see an unscathed Y/N walking out of the smoke with his hand stretched out.

Y/N: You call that an attack? I didn't even fell anything. Pathetic.

UG: HOW DARE YOU! KNOW YOUR PLACE WHEN IN FRONT OF YOUR SUPERIORS!

Y/N: And that's where you're wrong. All I can see is some little girl trying to play God after we left this world. Now then *portal appeared and a handle sticks out as he grabs it* Witness the power of the Herrsher of the Flame *pulls out a sword* (as I'm writing this my sister is playing DMC and "Bury The Light" is playing XD specifically the part "I AM THE STORM THAT IS APPROACHING!!!!")

Klee: *star eyes* It looks so cool. I wonder how big of an explosion it can make.

Jean: Klee no!

Klee: Klee yes!

Lisa: *whisper* I think I came a little.

Ei: *whisper* Me too.

Yae: *whisper* Me three.

Yelan: *whisper* Me four.

Beidou: *whisper* Me five.

Eula: *whisper* Me six.

Rosaria: *whisper* Me seven.

Shenhe: *whisper* Me eight.

Ningguang: *whisper* Me nine.

Venti: *nervous* Haha, am I the only one or do you guys feel the heat from that sword too?

Ayato: Yes. I feel it too.

Beidou: Now that's what I call massive fire powers.

Ningguang: Beidou. Please don't.

UG sent a lot of cubes at Y/N but he simply swung his sword horizontally and as it released a huge wave of fire all of the cubes got incinerated and UG got severely injured.

Lumine: *jumps up from the seat* YEAH! SHOW THAT BITCH WHO'S BOSS!

Y/N slowly approached the downed "god" who was on her knees and as he stood in front of her she looked up scared to the core. But he did something unexpected, he made his sword disappear and kneeled down on one knee and put one hand on her cheek.

Lumine: What? No! Bully her more!

Y/N: You know. You made my friend suffer a lot because of your dumb decision. And one time she told me that she wished that she could slap you with an oversized fish.

He stood up and another portal opened and he sticked his arm through it. Meanwhile the same portal opened above Lumine and his hand grabbed her head. He them pulled her out through the portal and put her in front of him and both the portals closed.

Childe: Okay the fuck?

Everyone looked at the screen shocked that Lumine now was there with him.

Y/N: And so. *creates a portal and pulls out a fish as big Lumine and hands it to her* Have fun. I'll just watch.

Diona: *drooling* 'That's a big fiiiiiiiish'

Xiangling: *star eyes* 'The food I could make with that wish!'

Kokomi: 'WHY THE FISH!?'

Razor/Gorou: 'FISH!'

Lumine: *takes the fish and turns to UG who stared at her scared* Ehehehehehe. Thank you, I'll enjoy this.

And so for the next 2 days 17 hours 54 minutes and 42 seconds Lumine repeatedly slapped UG with an oversized fish while Y/N just layed on a couch made out of fire and watched. Thankfully in the back of the theater was a house so the cast spent the time there while waiting for Lumine to finish. After she did she threw away the fish which fell into Y/N's portal as she approached the said man.

Y/N: You done?

Lumine: Yup. We can leave now.

Y/N: What about her?

Lumine: Don't know. Made her your pet or something.

Y/N: Good idea.

The screen turned off and the audience just looked at it in silence.

Jean: You don't think he'll actually do it?

Lisa: I'm.........not sure.

With that everyone dissappeared as the scene changed to Y/N's bedroom.

====SHORT LEMON====

We can see Y/N on the bed fucking UG, now named Kiana, from behind while pulling on her hair.

Y/N: Now who's your master?

Kiana: YOU ARE~ AH~ MASTER YOU~ AH~ ARE!

Y/N: Good girl. Now take it all inside.

Kiana: YES~ AH~ MASTER~

With those words Y/N came deep into her womb as she collapsed onto the bed passed out from the pleasure.

Y/N: Huh. You will do just nice~