I'm sorry I am getting to the request (Speaking off - I need more requests) that I have. I just thought of this while re-watching Mamma Mia and needed to write it before I forgot.

Also, this is as if Sealand is England son rather than little brother okay? Okay. On with the oneshot.

Warnings: May contain feels. (Sad feels)

Also, I chose England for this as he can actually play the guitar (Albeit the electric guitar but still)

-------------------ENGLAND'S POV

"Dad, could you please tell me about Mum?"

"I suppose you should know at some point. Come on the," I replied patting the sofa next to me. Peter came and sat beside me. I ruffled his hair before standing up, "I'll be back in a minute." I walked to the bedroom and got the guitar that (Y/n) had got me as a wedding gift. I smiled sadly at the photo of us on the beside table and walked back down to the living room, sitting back next to Peter on the sofa. I strummed the guitar before starting to sing...

FLASHBACK (SONG IS PRESENT DESCRIPTION IS FLASHBACK)

"I can still recall our last summer
I still see it all
Walks along the Seine, laughing in the rain
Our last summer
Memories that remain."

I was walking down the streets of London in the summer, even thought it was still cloudy it wasn't actually raining for once. I was so lost in thought that I didn't realise I'd bumped into someone until the squeaked, "I am so sorry, Love," I spoke reaching a hand out to help her up which she accepted.

"It's perfectly alright, sir. I wasn't looking where I was going either. I'm (Y/n), (Y/n) (L/n)," she responded sticking her hand out for me to shake.

"Arthur Kirkland, Love," I replied taking her hand and kissing it, like a proper gentleman should. I saw her face light up bright red and I knew I'd fallen in love.

"We made our way along the river
And we sat down on the grass
By the Eiffel Tower
I was so happy we had met
It was the age of no regret
Oh yes."

During the next few weeks we met up several more times and my crush on her grew. It was after the tenth meet up we had, that I finally had the courage to tell her.

"Those crazy years, that was the time
Of the flower power
But underneath we had a fear of flying
Of growing old, a fear of slowly dying
We took a chance
Like we were dancing our last dance

I can still recall our last summer
I still see it all
In the tourist jam, round the Notre Dame
Our last summer
Walking hand in hand."

"(Y/n), I have something to confess to you."

"Go ahead. I won't stop you."

"I-I love you. I have since the first time we met." 

I then noticed her smiling, "That's good because I've love you since we first met as well," she replied leaning into to me, "And I always will. For as long as I live."

I smiled as well and lifted her chin up, "May I?" I asked looking between her eyes and lips. She giggled and tackled me onto the grass, "You don't need to ask, Arthur," she spoke leaning down and kissing me. I reacted by wrapping my arms around her waist.

"Paris restaurants
Our last summer
Morning croissants
Living for the day, worries far away
Our last summer
We could laugh and play."

"(Y/n), will you do the honour of marrying me?" I asked down on one knee.

"Yes!" I stood up and placed the ring on her finger, "I love you," before kissing her.

"And now you're working in a bank
The family man, a football fan
And your name is Harry
How dull it seems
Yet you're the hero of my dreams."

"Arthur, you're going to be a father."

I smiled widely when I heard those seven words come out of her mouth. However I aware of the heartbreak that would come later.

FLASHBACK END - BACK TO JUST NORMAL TIME

"I can still recall our last summer
I still see it all
Walks along the Seine, laughing in the rain,"

I sang, tears streaming down my face; I still hadn't got over it. I placed the guitar down next to the sofa and Peter curled up to me," I'm sorry. So it's my fault that-" he was interrupted by, "Our last summer; Memories that remain."

My head shot up at the voice and I looked to the doorway, "(Y-(Y/n)?!"

"Yes. It's me."

"How?! The doctor said-" she shut me up by placing a finger on my lips, "Don't believe everything that doctors say, Artie. If that happened, would I be here now?"

"Good point but why? And where have you been for all these years?"

She took a deep breath before speaking, "When I told my parents about it, they said that the minute the baby was born, I had to come back to them. They also said I couldn't tell you the truth and, I'm sorry. I hope you can-" I shut her up by pinning her to the wall and kissing her. I immediately felt her arms around my neck. "Of course, I for give you, Love. I would never be mad at you."

"That's good."

"Peter, this is your mother," I spoke addressing the little boy who was still in the room.

"Really? I thought you told me that-"

"I know what I said, Peter but, that's what I was told by the doctors that day."

"Oh," he responded running up and hugging (Y/n), "It's great to meet you, Mum."

"It's good to meet you too, Peter. Or should I say 'son'? Arthur, you can stop moping now."

"I'm not moping!"

"He has! He's been moping for the past six years, Dudette!"

"Shut up, you Bloody Wanker!" I shouted back.

"You know what this calls for?!" Alfred shouted coming into the room, "A party!"

"Did you not just have a party last night?!"

"Well, this is a special occasion! To celebrate the Dudette's return! And you actually being happy again."

-------------

So, Alfred eventually convinced Arthur to have a party. The whole world turned up and the minute they arrived, Francis and Gilbert lifted me in the air so I was on their shoulders. By the end of the night, most of us were drunk (With the exception of the Italy brothers, Seychelles (She doesn't seem to have a human name), all the micronations, Matthew, and Roderich (Because he refused to drink anything)). The Bad Touch Trio were all passed out on the sofa and many others passed out on the floor of the living room. Only me and Arthur weren't passed however, we were still to the point of tipsy, where you mind gets foggy and you can't remember what you do. We ended up in the bedroom and thus, Peter had a little sister... (Although, unlike Peter, she didn't have Arthur's massive eyebrows.)