A/N: Enjoy :)

Disclaimer: I do not own Marvel, Disney, ABC or the Avengers.


I was lethargic as I rolled out of bed the next morning. Steve and Bucky had kissed me before leaving for their run. The weather was starting to turn, and I was hesitant to let them go. It was selfish of me, but I needed their comfort. So, instead of the guys, I cuddled with my babies in bed. They koala held either side of me as I hummed them songs. Elijah was rearing to go after the power nap we all had, running around with Joey. Callie was a little more calm, talking to me about the coloring books that Grandpa had got her.

All Avenger themed.

Quickly getting them fed fro the morning, I brought them back to the apartment with one goal: Pack everything. As I packed the kids bags, unloading the drawers, I noticed that they went through another growth spurt. The clothes I had managed to get them in were way to small. Groaning to myself, I scooped both kids up and said, "Stop growing."

"But we want to be big Momma!" Elijah said, giggling as I kissed them.

"I understand, but it would be nice if I didn't have to go shopping every two weeks," I joked, tickling them as Joey sat patiently in front of us.

"Momma, I'm a big girl. I don't want baby clothes anymore."

"Well, your Daddies and I want to take you to see Aunt Peggy, but nothing fits you! I guess, we'll just have to go shopping," I sighed. Callie smiled happily and Elijah was indifferent as he shrugged, "I like my clothes."

"You also like growing. Doesn't mean I'm gonna stop buying you guys clothes."

"Can Auntie Nat come?" Callie asked, beaming.

"Yes," I smirked, "I need a second pair of eyes on you two."

"Can I go get her?"

"You remember the way to her room? Lead the way." I smiled at my little girl, as she took off out the door of their room to the main apartment door, with Joey hot on her heels. Elijah and her ran excitedly to the staircase, each taking ahold of the railing, and giggling as the descended.

"I hear two munchkins!" My Dad's voice said as he rounded the corner to scare the kids. They screamed and giggled as he gathered them up in his arms.

"Hi Dad," I said, kissing his cheek as he held the kids against their will.

"I'm not Dad, I'm Grandpa Ticklemonster," He said in a silly voice before ticking the kids with his beard against their necks.

"Well, Grandpa Ticklemonster, release my kids." I joked.

"Fine, but only if they promise me hugs and kisses," He said, laying down the law.

"We promise!" Elijah yelled.

"Square deal." Dad said, letting them go, only for them to jump back on him and kiss his face.

"Where are you going in those clothes?" Dad said, noticing what I was only just realizing.

"To get Nat. I need an extra eye on them while we shop."

"Say no more! I'll get a whole new wardrobe for them. I would say about 3 sizes up, wouldn't you?" Dad said, looking each of them over.

"At least. And they are only going to keep growing. They are supposed to look like two year olds when they are one. They look three or four now," I said, confused.

"We'll have Dr. Simmons runs a few tests. They are fine. They are still your babies. Relax." Dad said, picking up Elijah and saying, "You are getting heavy bud."

"Soon, I'll be as tall as Daddy and Dada."

"Well, don't go growing too fast. I still need to donate all your old clothes, and in two weeks I'll have to do it again!" I sighed, taking Callie's hand and leading her towards the labs.

As my Dad talked to the kids, I realized that I hadn't seen Daisy or Phil in a few days. I was a little wrapped up in my husbands and kids, but I was sure that they were still on base.

"Auntie Jemma," Callie yelled as she saw her scientist Aunt working through the window.

"Callie, darling, please stand back while I put down this chemical." She said, making Callie pause in spot. Jemma was carefully placing it in a safe place when Pietro picked up Callie and plopped her on his shoulders.

"'Ietro!" She giggled.

"They grew again," I sighed, as my Dad put Elijah down on Jemma's exam table.

"Children do that," Dad quipped.

"But not this fast. Jemma, you said they would look two by the time they were actually one. They look almost four."

"A slight miscalculation. I'll run a few tests," She said, calming me.

Dad came over to the table to keep Elijah company, while I paced. Pietro was helpful to Jemma, grabbing her instrument tray, scanners, and keeping Callie smiling as Jemma took blood from both my kids.

"Dad, could you…" I asked, and he didn't need any more instruction.

"I'll get the old geezers. And I'll make a call about their clothes. Relax baby girl," He said, kissing my temple and leaving the room.

"I'm trying to." I sighed.

Another few moments silence, and Jemma said, "A quick run through the microscope, and I'll know. Breathe Sera."

"Trying to," I said, holding Elijah's hand, as I inspected how his skull had grown. A full minute passed as I observed both of my children, and another four before Jemma finally spoke up. She looked afraid of whatever she wanted to say to me.

"We can still give them the anti serum. Pause all this growing."

"Not a chance."

"It's a good option. If this is what you want, to have them grow slower, it will."

"I think I need to discuss this with Steve and Bucky before we jump to anything." I said as a machine beeped. Elijah was busy talking to Pietro about his time in the snow yesterday.

"Oh dear," Jemma said, brow furrowed.

"What's oh dear?" I asked, watching as she read the results of her tablet.

"What's happening?" Bucky asked as he and Steve ran in.

"The twins are growing at a much faster rate than Dr. Banner and I originally conceived. Both serums were designed to stimulate muscle growth at en exponential rate. And by these figures, the kids will reach the biological age of 6 before their first birthday. Their growth pattern suggests that it will slow down once they are fully developed." Jemma said softly. I felt myself falling backwards as my husband's arms circled around me.

"My babies, I go so little time with them." I whispered, looking over at their little faces.

"So, we will have teenagers by the time they are two years old?" Steve asked, doing the math in his head.

"If we monitor them, and record our findings we may be able to rough out an algorithm, that will calculate the time needed for their full development." Simmons says, to which a voice says, "Already on it."

I turn my head to see Bruce in the corner, creating an algorithm on his clear white board. Squinting, I noticed a pattern. A factor he used as time was a fourteen-day period, multiplied by seven months.

"You've been monitoring them."

"They are family." He said softly and I nodded, smiling at him.

"They roughly grow a year every two months. So, factoring in environment, exposure to radiation, and their advanced learning capabilities, coupled with how I've seen it slow down over the past three months, not accounting for your time in the alterna-"

"Bruce," Steve said, knowing Bruce would go off on a tangent.

"Right, so I theorize that they will start to slow down even further in the next three years. They will be twelve year olds by the time they are two. And sixteen by the time they are three. Eighteen by the time they are four. They will reach twenty years old biologically by they reach the chronological age of five years old."

"Or, we administer the suppressant to the serums, and they age normally." Jemma suggested, and Bucky sighed.

"Let's just… Discuss this."

"We knew they were going to grow faster." Steve said, watching me.

"But not this fast. I can't in good conscious, give them this serum, and stunt their growth. Even if it's unnatural to us, its how they grow. But I want them to have a normal childhood. But things would be easier if they were bigger. Is that wrong?" I asked the guys quietly.

"No, I get it. It's been nice. Not as many issues, like we would have had with them still being babies." Steve said.

"Like, when they were smaller, we couldn't leave them."

"You couldn't leave them. It was my milk, dummy. But, now I have to homeschool them that much sooner," I sighed.

"But now you'll be home," Bucky said, giving me a small smile.

"Is it bad that I want them to grow at the rate they are?" Steve said, eyeing our kids as they played with Pietro.

"Let's talk about it tonight, after they are asleep." I said, noticing how they were looking at us.

"Momma, what's wrong? Are we sick?" Callie asked, intuitively.

"No, my darling. We just wanted to see how much you've grown. But I think we should make a height chart instead." I said, picking her up off the table and looking at Bruce and Jemma as I placed her on the ground.

"We are gonna talk about it. I'll have an answer for you tomorrow." I said softly and they both nodded.

"We'll see you at dinner."

"It's mine and Natasha's turn to cook."

"We are leaving tomorrow afternoon for Winchester," I replied, "So if we decided, to do this, it would have to wait."

Steve picked up Elijah and said, "Let's get these kiddos some lunch." Following my husbands, with my Callie hanging onto my fingers, I thought about what arguments Steve and Bucky would make to keep their growth rate, or slow it down. My heart raced as I realized how little time I would get with my 'little' ones.

Nathaniel was almost the same age as my kids, and he was still in his baby stage. I missed when they were little, but they were much more interesting now that I could talk to them and teach them. As horrible as it sounds, I was relieved they were growing so much, because it meant that soon, I could leave them on their own, and work.

But I also wanted another baby in the future. And what if that baby had the same serum enhancement that caused it to grow and mature at an accelerated rate? I would only get these years for a short time, shorter than most parents. Did I really want to give them up for selfish reasons?

As I watched my kids coloring at the table, I made sandwiches for them. The guys were having leftovers of Jemma and Wanda's dinner, and clearly enjoying it again. I made myself a salad, and ate it miserably. Oh, the joys of clean eating for a growing baby, said no one ever.

"Why are you staring at that salad like it kicked a puppy?" Bucky asked, and I kicked him under the table because the kids looked sad at his question.

"No one kicked a puppy. I'm just upset that I have to eat like a rabbit again. But it will be worth it for…" I said, trailing off as Bucky seemed to realize what I was saying.

"Ah. We also have to talk to the kids about that." Steve said, and I nodded.

"Let's just focus on our visit with Peggy, and packing." I replied, ending the conversation as I stabbed my salad again.

"Good news, new clothes should be here within the hour. I sent a Quinjet to pick them up. May said she was getting antsy and needed to fly," Dad said, rolling his eyes as he came in.

"You sent May on an errand. What did you promise her in return? She doesn't play assistant for anyone."

"I promised her a vacation, with her husband."

"Ex-husband."

"Semantics," He said, waving me off.

"No, that's just a fact. They refuse to talk long enough about their feelings for each other, and it's really ticking me off. I already had to go through SHIELD with May's grumpiness from her divorce and the Bahrain incident. I don't need it here. I've been tortured enough."

"For a therapist, you are very self centered."

"What can I say? I'm a Stark." I said, sticking my tongue out at him.

"Touché." He smirked, grabbing an apple from the fruit basket on the table.

"Tony," Steve said, sounding conflicted.

"Steve?" My Dad asked, gesturing in confusion why he had stopped his obvious train of thought.

"Nothing," Steve said, shaking his head and looking down at his dinner.

"Alright then. I'm headed back to New York, unless someone else has something to add."

"No, wait. Tony, would you like to come see Peggy with us?" Steve said in one breath.

The silence that came from my father was more of shock. He knew how much Peggy meant to Steve, and was willing to share some of Peggy's last moments with us, but more importantly him.

"I could shift some things around. Any excuse to hang out with my grandkids," Dad said, not teasingly, which shocked me. He seemed sincere, and then I remembered that Aunt Peggy had been the one to tell Dad that his parents had died. She was a big part of his life, just like Jarvis was.

"At least we can all say goodbye this time," I whispered, taking Dad's hand.