Elemental Hero in Teyvat

Sekai currently with Aether and Paimon in Jean's Office. Jean gives them instruction for them to go visit Mondsdat Cathedral. They will be accompanied by Eula to get request from Church.

When they reach in front of cathedral door, Eula greets and join them opening the door. They were greet by a nun along with other two.

 Nun: Welcome Travelers and Captain Eula, thank you all for coming here.

Eula: its fine as we come at your request. How can we help?

Nun: we would like your help to escort some special relic.

Sekai: Of course, that kind of help. *sigh*

Paimon: Hey! No need to be rude Sekai.

Sekai: But that kind of quest is boring, and its you're that go on and on whining about how our quest have been boring…

Paimon: Ehehehe… but with you here, thing will not be that bored right?

Sekai: Come on, escort missions are boring. And you're the one who keeps whining about how our recent quests have been dull.

Paimon: Ehehe… but with you around, things won't be boring, right?

Sekai: What do you expect me to do, a street performance on the way? You do realize that would attract unwanted attention? And considering we're escorting something bad people covert, that's not exactly a smart move.

Paimon: B-but… Paimon will get bored…

Sekai: Fine… just this once. But in return, you have to be my hug pillow for a night.

Paimon: Deal!

Sekai chuckled as he reached out and patted Paimon's head, while Aether simply smiled at their antics.

Eula: Sekai really has soft spot for Paimon…

She said with little envy, while pouting thinking on how nice if she trades place with Paimon.

Aether continues the conservation with nun to get the detail of the request they taken,

Nun: Also, there will be someone else will accompany you three.

All: Eh/huh? Who?

Nun: Rosaria! Can you come here please.

The nun said as the four of them heard footstep coming, they shift their attention on the person making Sekai notice that nun look very familiar to him as his eyes began to widen in realization. That nun is the same nun that attacked him last night.

Rosaria: You call for me sister?

Then the nun looks at her and nods.

Nun: Yes, I want you to accompany Captain Eula and her companion on this escort mission, do you understand?

Rosaria: Yes.

As soon as Rosaria laid her eye on them, she quickly notices Sekai behind Aether as her eye widened in surprise.

Rosaria: Darling!

Then she suddenly tackles Sekai to floor causing everyone to jaw drop with eyes widen.

All: DARLING?!

Sekai: Huh?!

Sekai: W-who are you calling Darling all of sudden!?

As Sekai quickly get up and Rosaria quickly follow after him. Then she quickly hugs him making Sekai blush and flinch at her antics.

Rosaria: You~ of course!

She said in childish tone while still hugging him as Sekai avert his gaze but failed to hide his blush due to Rosaria's chest pressed against his chest as he can feel their softness until he felt hand on his shoulder.

Eula: Do you mind explaining, Mr. Silver?

Sekai now sweating bullet and shaking in fear as he can feel dark aura surrounding Eula.

Sekai: *scared* E-Eula-san?

Suddenly Eula pulled Sekai another arm trying to release him out from the nun.

Eula: Ms. Rosaria, can you please let go of my future husband, he has another thing to prioritize!

Eula said while trying to pull out Sekai from the nun, but Rosaria managed to grab his arm before he could slip away.

Rosaria: So, then I'll help him out on his work!

She said while trying to take back Sekai to her while Eula pull his other arm.

Eula: That won't be necessary, he can handle it on his own!

Rosaria: No! I insist it would be unfair to let him do all the work after all!

Sekai: Ow!x3 you two going to break my arm!!

-Small time skip-

The group is currently walking while guarding the caravan escorting the relic. Rosaria is currently happily clinging to Sekai's arm while he is currently can't stop blushing with a hint of fear as he look behind him and saw Eula who glaring at him intensely while Aether and Paimon just smirk at his current predicament.

Aether: *puf* That really unexpected situation you get there Sekai.

Paimon chuckle and nods at traveler. Sekai can only glare at both of them.

Sekai: H-hey, Miss Rosaria, can you please let me go? It's hard to walk like this you know.

Rosaria: Just Rosaria darling… and n—

Eula: You heard him!

Rosaria: Grr… fine I'll let go for now.

She said while glaring at Eula while Eula also glares at her as the two boys with a little Paimon only watch and shriek into fear as they can feel spark from them.

As Sekai sigh in dismay knowing that this two will be like this for the whole journey, while Aether just smirk at him then have a look of realization on his similar predicament with Amber and Noele, making the traveler also sigh in defeat.

It currently nighttime as the group currently set up camp after of hours of walking along the caravan.

Sekai currently sitting on log while watching the campfire until Paimon start nagging him to do a something interesting like he promises.

Sekai POV

Sekai: (Ugh, when Paimon get bored she going to be whining on all night, even though it's kind of adorable, I'm prefer her as hugging pillow then whining child. I gonna come up with something)

I placed my hand on my chin trying to come up with something, until I remember I got curse of Emiya… shit that sour me. But hey it also come with projection ability… well it's worth it… maybe…

I extended my hand as I began to imagine the thing I needed.

Sekai: Trance On!

Suddenly an electric guitar appears on his hand.

Sekai: Its work!

3rd Person POV

Everyone was shocked when an electric guitar appears from Sekai's hand

Aether: What that?

Paimon: Yeah, what that it looks like musical instrument from Liyu but it didn't have that Big box connect to it.

Eula: Yup, can you explain it to us.

While Rosaria only nods in agreement to him.

NOTE: (As for why they found out thing appear out of nowhere is not weird because Vision holder can keep their item in their Vision, but the space is limited. It's also same to Traveler, as he keeps them is sub space. That why, he didn't need to bring backpack on his travel, so other thought that Sekai just bringing out item from sub space inventory. For Sekai, his power watch also come with inventory function, credit to ROB for that)

Sekai: Well that a correct guess Paimon, a head pat for you.

He gives pat to Paimon, while Eula and Rosaria look at Paimon with envy.

Sekai: As for what it calls, it called as Electric guitar, or Electro guitar here, I guess…

Aether: Okey… what are you going to do with that?

Aether asked Sekai, as Sekai just smile with nostalgic look.

Sekai: Just sit down and enjoy the show.

Sekai proceeds to strum the electric guitar and start to sing "Sugar Song to Bitter Step" from Blood Blockade Battlefront anime. 

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Everyone was shocked as this for the first time they heard him sing a song and soon they clap at Sekai's performance.

Eula: You got beautiful voice, Sekai.

Paimon: Paimon agree!!

Aether: *mumbling* Sekai… do you also come from another world

The elemental young man just blushes a bit while scratching the back of his head, while laughing a bit.

Sekai: Well, if you're all entertain, Thanks… *mumbling* I guess a little bit of curse is worth.

After that Aether and the two girls were asleep. Sekai with sleeping Paimon on his hug stay on guard as he smiles staring at the night sky. Ever since he got reincarnated into this world, there many people he met, and he was grateful for ROB for his second chance.