After the duel with Takao.

Y/n:Edward do you have a gym nearby?

Edward: Yes just take a left and it will be there.

Y/n: thanks.

meanwhile Bismarck's POV

I wanted to congradulate y/n for such a display of strength but when i got down there he's was no longer with us.

Bismarck:Kommandant where is y/n?

Edward: He went to the gym most likely to keep his physique in check if you want to see him shirtless.

Bismarck (thoughts) He really must a solid build i've seen a small portion of his muscles while he was wearing that armour he's my type alright.

Bismarck blushed as she kept thinking of y/n.

Edward: I see you love him dearly Bismarck i never took to for being the foward type.

Bismarck blushed even redder he knew he was right.

Bismarck: I love him even though he may have an intimidating aura around him he is also very caring that's what makes him special.

Bismarck walked towards the gym in search of y/n Roon, Freiderich and Graf Zeppelin started walking along side Bismarck.

Graf Zeppelin: Why are you walking toward the gym Lord Bismarck?

Bismarck: I actually want to see y/n i heard from Kommandant that he is working out in the gym.

3rd person POV

When the three girls arrive at the gym they caught their reward a perfect body any girl could ask for.

Chiseled 8 pack abbs

Veiny arms

Visable Quads

A handsome yet scarred face

Perfect back muscles

Bismarck's nose started dripping blood as she stood wide eyed at the demon killer she broke out of her trance when...

Y/n Like what you see?

He smirked

Graf Zeppelin kept her eyes on y/n's body the entire time still bewildered on how he got such a good body.

Graf Zeppelin (thoughts) I could really have him as a husband maybe have 3 children or 4.

Zeppelin blushed redder than a tomato.

Friedrich der Grosse watched the battle hardened demon slayer as he continues his work out

Friedrich(thoughts) I just want to pamper him so much his eyes have that look of hate,regret,rage,and sorrow. I'll need to take care of him i consider him my son.

Maybe i'll get married to him oh there is so many things i'd want just his presence is more than enough for me.

Bismarck,Graf Zeppelin and Friederich watched in awe in how much he was deadlifting.

Bismarck: that's three quarter tons he's lifting and he is making short work of it not even showing any fatigue.

after working out not even breaking a sweat y/n went to the beach to cool off.

Y/n POV

As i was relaxing in the sea i heard the sirens go off i summoned my praetor suit and combat shotgun ready for deployment i sprinted toward the meeting room where six others were discussing the plan.

Y/n: What is the problem?

Enterprise: Sirens invading east end of the island.

Nagato: we are trying to figure out a plan of action.

Mutsu: He is no longer here.

All: What??

Meanwhile with Y/n

Y/n: Vega how many are we talking?

Vega: A full invasion force my estimate would be 94 sirens in total.

Y/n: Not even a warm up.

As Y/n continued down toward the east end of the island he saw sirens.

Y/n: I take it back This is a perfect warm up.

Observer POV

While i was collecting data from the kansens i saw a man in green armour there was no data on him what i saw was terrifyingly insane he had an bloodthirsty aura around him then a gun manifested into his hands.

Y/n: You came all this way just to die saves me having to sprint to you i do hope you last better than the demons of hell.

I couldn't believe what i was hearing i got on to the Empress and told her about the anomylous person.

Empress: See to it that he is destroyed.

Observer: Slight problem with that.

Empress: *sigh* What problem?

Observer: He just said "hope you last better than the demons of hell"

Empress' eyes widened : Retreat the mission is a failiure.

Observer: Why we were about to get started-

Empress: He will kill you instantly retreat.

Observer: Yes mistress oh no he is already onto me- AHHH

The Empress became furious.

Empress POV

How can he move so damn fast is what i'm trying to figure out he killed Observer with just his hand now i won't be able to gauge him.

Y/n POV

After killing Observer i walked back to base de-summoned my armour and walked toward the beach everyone looked at me in fear with what i did to Observer then Bismarck broke the silence

Bismarck: How in the world did you get that strong?

Vega: Push ups, Sit ups and plenty of juice.

Bismarck blushed as y/n took off his shirt and went to the cold sea.

Hood: I could see George having him maybe wales.

KGV POV

I walked along the corridor to the commander's office and I noticed a male with brown hair gold like eyes very muscular coming towards me.

Edward: Ah I see you just met the doomslayer or Y/n. George.

Doomslayer? Y/n? Ah I see the siren slayer no wonder all the mature ship girls have their eyes on him.

To Be Continued