A/N: By popular demand I've put an epilogue into this fic, since people wanted to know what happened next. Warning: Serious fluffyness ahead!
Two Years Later
Ianto leaned over and kissed Jack on the cheek as he bounced the burbling baby girl on his knee. She had a small bob of messy back hair and sparkling blue eyes.
"She's beautiful," he whispered.
"Like her name," Jack grinned.
"Tanwen. Just like she said."
Ianto placed Tanwen into a baby seat on the floor, "Hey Yan."
Ianto didn't look up as he was playing with the baby, "Yeah?"
"I was thinking, since we have a baby… perhaps we should, you know, be a proper family?"
"We are a proper family Jack," Ianto's voice was slightly muffled and Jack had to try hard to resist the urge to laugh.
"No, I mean… erm. Ianto, what would you say if I asked you to marry me?"
Ianto bolted upright.
"If I asked you to marry me, what would you say?"
Ianto grinned and wrapped his arms around Jack's neck, "I'd say: Jack Harkness, of course I will."
Jack was dangerously close to crying… but he didn't do that sort of thing, "That's good to hear."
And he kissed his fiancée.
Ianto pulled back for a second and smiled, "Jack Harkness, are you settling down?"
He considered this, "You know, I think I might be," and they resumed their kiss with baby Tanwen giggling in the background.
Six Year Later
Jack opened the door to their flat letting a hyperactive Tanwen burst inside.
"Tanwen, watch out for my tummy."
The six-year-old blushed, "Sorry Dad. Are we going to tell Tad?"
"Yeah, yeah, but don't jump on him. He's not feeling well."
"OK!" The girl raced through to the living room, quickly followed by a loud yelp from Ianto.
Jack grimaced at the shout from the living room and ran through to help Ianto out of the tangled mess of blankets, dressing gown and six-year-old, "Feeling better?" Ianto sneezed, "That'd be a no then?"
Ianto glumly nodded, "How was Tanwen?" the flu muffled his voice making Jack smile.
"Trouble, as usual."
Ianto chuckled, "And the scan?"
"S'twins!" yelled Tanwen delightedly.
"Tanwen! I was going to tell him!"
Ianto's mouth dropped, "Really! Twins Jack?"
"Yup, both healthy."
Ianto remembered that conversation eight years ago, "Boy and a girl?"
Jack grinned, "Yup."
Ianto placed his hand on Jack's stomach. It was still almost perfectly flat, "You sure there's twins in there?"
Jack chuckled, "Yup."
"That's good," Ianto pulled Jack into a kiss while Tanwen grimaced and covered her eyes behind them.
"Get a room!" she giggled.
Jack broke the kiss and turned to look at the girl while turning his pretend menacing look up to eleven, "Oi, you stop listening to Uncle John!"
The little girl giggled as Jack chased her out of the living room growling. Ianto pulled himself up using the back of the sofa for support, "Jack! Don't do anything stupid! Please!" he yelled.
Nine Years Later
Jack held the gold disc carefully in his hand. He looked to Ianto who had been twisting the gold band around his finger now for about five minutes.
"Do you ever wish it was different?"
The other man looked up, "What do you mean?"
"If we hadn't found out we were going to have kids. Would you have liked that better?"
Ianto sighed, he'd been toying with this question for a while now. He looked out to the main hub. Tanwen had adopted Jack's characteristic pose of 'feet thumped up on desk' while holding a mug of tea in one hand (the mug proudly proclaimed 'Space: Been There, Done That') and a Shakespeare text book in the other. Roan and Dayton were chasing each other around various desks and annoying the hell out of everyone else in the hub. He smiled proudly.
"Me neither. I suppose we have to go put this on Gwen's desk then…"
"Or we could leave it here."
They had two choices really. They never really found out if Tanwen got back to them, or if she had ended up eaten by a dinosaur. They could easily not take the risk. Keep their daughter safe.
But that would cause one hell of a paradox!
And the Doctor wouldn't be pleased, Jack didn't want to get yelled at again.
And they might not end up having the family they did have.
It was quite an easy decision really.
"We can't do that Ianto. Can't mess with timelines."
Tanwen looked around. The hub was empty. Was it her hub?
She ran to her desk- everything was still there. Her Shakespeare text book, the funky paperweight thing that looked like it had a galaxy inside it that the Doctor had found for her… and her mug. The one that she was sure had smashed when she went back in time. But there it was.
She picked it up and looked at it carefully. There were a few hairline cracks in places, and she could see tell tale signs of superglue. Inside there was a note written in her Tad's neat handwriting.
Roan says sorry for vaporising you and breaking your mug, so we glued the mug back together.
She smiled, "Oh Tad"
She ran up to her Dad's office. She carefully eased the door open.
Her parents were sitting in the corner of the room, Dad had his arms wrapped around Tad protectively. They both seemed to have fallen asleep, which wasn't unusual for Tad, but for Dad… he hardly ever slept.
Jack's eyes opened slowly, there were dark circles around the edges of his eyes. He smiled, "Hi Tan," he shook Ianto slightly, "Yan… Yan…," Ianto didn't even move, "Oh for god's sake, YAN!"
"Huh? What?" he mumbled.
"Wake up, Tanwen's back"
Ianto sat up quickly. He stared at his daughter- she noticed more dark circles- he was checking she really was there and that she wasn't just part of a dream. He grinned and stood up shakily.
Tanwen resisted the urge to run to him and instead walked towards him.
He grabbed her in a hug, "I didn't think you were coming back"
Jack joined the hug.
"How long have I been gone?"
Ianto pulled out his old stopwatch, "Five days, three hours and twenty seven minutes"
Jack grinned, "We were worried you'd been eaten, or lost in the vortex or something when you didn't come back"
"Nah, nothing quite so dramatic, do you two want a cup of coffee or something? No offence but you look terrible."
Both men nodded, "I'll come help you," said Ianto.
"OK," she smiled.
As they walked out of the room she whispered to her Tad, "What's wrong with Dad? He never sleeps…"
"He was worried about you. We all were…"
"Don't worry about it. You're back"
She grinned, "Of course I'm back. I love this place. I don't think I ever want to leave"
A/N: Thanks for all the reviews, they helped me so much with this fic, and gave me loads of warm-fuzzies. Thanks for reading.