I don't own these characters; DC does.

Public Service announcement: this story contains underage/teenage sex, A/B/O dynamics, and some G!P/futa. If you don't like those things, then this might not be the story for you. If you don't mind those things, continue reading.

A/N: this is a gift for Costia_Gray. I never hit prompts quite right, but thankfully she felt me with this. "Honestly, anything with… fave tropes and likes is cool with me! I don't have any particular guidelines in mind." That made things easier and then I was left with these gems that I tried to fit in this fic: Touchy-feely Kalex taking care of each other, foodie Kara, Kara being comfortable showing off her intellect, Alex wearing/tattooing Kara's coat of arms (either by her own choice or at Kara's request), cohabitating, high school, A/B/O, soulmate bond, alien biology/customs/culture, and pregnancy/kidfic/babyfic. I tried my best to work with these from likes and tropes I was given. I hope you like it, Costia_Gray.

Thanks to my beta, Sydney. Happy Holidays, everybody. Come say hi to me on a href=" SL-Kassidy-482097488469386/"Facebook/a.

Going Through Changes

1: It's Different

Kara did not understand and that always upset her. Alex had learned that fairly quickly in Kara's stay. Alex understood why that was now. Kara was a person who literally lost everything, including her purpose in life, the whole reason she was meant to survive. And Clark was such a tool, he did not realize he helped destroy a person who had been willing to devote her entire life to his existence. Instead, Kara had no reason to live, no reason to go on. When she did not understand why things were happening, it always made her feel like she was losing everything all over again.

It had been a struggle at first to get Kara to do the most basic things, not out of failure to comprehend, but out of sheer apathy. Eventually, she got out of that, but it was always a fine line. Any little thing could throw Kara off balance and for Kara that always meant the end of the world. And, right now, it would seem it was the end of the world, as it had been most of the week.

"Hey, kid," Alex said as she climbed up on the roof, warm air hitting her bare arms. She had on pajamas, a tank top and thin pants.

Night protected them from anyone seeing Kara actually floating just above the roof. She was tucked into a tight ball, knees to her chin. If sorrow had a physical form, it would this version of Kara. I hate when she's like this. I just want to take all her pain away and let her live as the stupid beam of sunshine she is.

Alex was not surprised Kara did not move at the sound of her voice or at her movement. She could already hear all the ways Kara thought she had done something wrong, had done something to be punished. For the first few months of her stay, all one of them had to do was glance at Kara in an off manner and she would apologize for everything under the sun and above.

Alex eased over to Kara, careful not to fall off of the roof. She wrapped her arms around Kara. Usually, Kara would throw herself on Alex for comfort, but now Kara did not even acknowledge her presence.

She gave Kara a little squeeze. "Kara, come on. Talk to me. Tell me how I can make it better." That had been her personal duty for almost a year now, after getting over herself and her jealousy in having to share her life with an alien. It had taken a few months when Kara first arrived for Alex to realize the extent of Kara's loss. A weaker person would have crumbled and while Kara had barely been keeping it together in the beginning, she had held together enough. "Kara, please." She whimpered. Her heart ached.

Kara's head shot up and she looked at Alex, eyes big, blue, and sorrowful. Then came her puppy dog pout. If Alex had not broke down a year ago through simple understanding of Kara's circumstances, the pout would have eventually gotten her. Even the biggest jerks at school left Kara alone once she pouted.

"I'm sorry!" Kara held up her hands and moved closer to Alex.

Alex's brow wrinkled. "What are you apologizing for?"

"Because I made you sad!"

Alex shook her head. "I'm sad because you're hurting and you won't let me help you, you dummy." She reached out, caressing Kara's cheek. It was so soft to be bulletproof. "Let me take your pain away."

Tears slid down Kara's face as she shook her head. "I'm not sad! I'm okay! I'm okay!"

Alex knew that panicked tone. That was Kara's "I've messed up and you're going to send me away" voice. Alex did not understand the fear, but her father explained how and why Kara had these "abandonment issues." Clark had helped build that terrible wall, but it stemmed from losing everyone Kara had ever cared about in one awful event. Alex and her parents did their best to assure Kara they would not leave her, no matter what happened.

"Kara, you're just moving down the hall," Alex said.

The Danvers family had spent their Saturday setting up Kara's new room. She had her own room now, her own private space. Most teenagers would be elated over this. Kara took it as being thrown out of Alex's room, a broken partnership. They talked about it so many times during the week. Her, her parents, so they thought it would be fine. How wrong they were.

"Because you don't like me anymore!" Kara sobbed, rubbing her eyes. "I know we're not bond mates, but I didn't think you'd hate me!"

"Kara, it's not that! I told you! We told you!" Alex wrapped her in a tight hug, pulling her as close as she could so Kara could feel it. She kissed the top of Kara's head. "I told you you're my own little personal ray of sunshine." A term of endearment had helped Alex bond with Kara once she decided she would do her best to help heal the Last Daughter of Krypton. It worked. Kara used to melt over any little nickname.

Kara shook her head. "But, our room…"

Alex sighed and stroked Kara's head. "Kara, you can still come in the room any time."

"But, not to sleep."

"You can sleep in there, too. If you want." Alex was not sure if her parents would like that, but if it helped Kara, her parents generally folded. They might have an uncomfortable talk with her about it first, but that was okay. She would endure it for Kara.

"Then why'd I have to leave in the first place?" Kara's body shook with another sob. Her face was flushed and fat tears flowed down her cheeks.

"My parents think we need our own space because we're getting older," Alex said the practiced line for maybe the millionth time.

"But, why?" Kara looked at her with a wide, wet sapphire gaze.

Alex wiped Kara's face and decided to tell Kara the full truth, once more. "Kara, I told you that I presented the other day, right?"

"Yeah."

"Mom and Dad just think since I'm an alpha, I should have the room to myself in case…" Alex blushed. No one said, but the privacy issue was in case Alex explored her newly formed body. Well, one of the reasons anyway. The way her mother looked at her and then at Kara, Alex suspected she was not getting the full story from her parents, but there was nothing new there. She did not even get the full story about Kara until well after they decided to take in an alien.

Kara twisted her mouth. "I don't get why our ages mean we need separate rooms. I like being in our room. Again, I know it doesn't mean we're bond mates. I won't make that mistake again. But, I like our room."

Alex sighed and scratched her forehead. She did not know how else to put this without sounding gross about it. "Well, maybe you'll get it when you present."

Kara squinted and Alex started to understand the underlying problem here. Kara did not get what changed between them. Kara still had so much to learn about humans, both biologically and culturally.

"Kryptonians don't present, do they?" Alex asked.

Kara shook her head. "No."

"And you've spent the past week not knowing what the hell I'm talking about, huh?"

Kara shook her head again and whimpered a little. "No."

Alex groaned and palmed her face. "Kara, you know you can ask me this stuff!"

Kara chewed the inside of her cheek. "I know, I know. But, I've been here for over a full cycle and I should know so many things I don't and when you talk to me like I should just know, I feel like a disappointment when asking."

"Aw, you're not a disappointment." Alex gave her another hug. "You're not from here. It's okay." Well, it was okay now. It used to drive Alex crazy and when she was a more selfish teen, it bothered her. Of course, it bothered her. She wanted to be cool and that was impossible with this little weirdo. But, now, this was her little weirdo. She rubbed Kara's shoulder.

Kara smiled a little. "Um, so can you tell me what it means that you presented?"

Alex nodded. She could give Kara the basics of it. Science never scared her and Kara tended to understand things whenever they put science first. But, if Kara had non-science questions, she would send Kara right to her mother.

"So, do Kryptonians go through puberty?" Alex asked.

Kara squinted as she searched her mind, probably trying to find the equivalent in her native tongue. "I don't think so. What is it?"

"The human body begins to change for sexual maturity."

Kara looked like a light bulb went off in her head. "I think we used to have that, but I think it might have stopped because of the Birthing Matrix. But, I could be wrong. Kal-El's parents had a natural birth. So maybe we do. I dunno. I mean, we obviously reach a point of sexual maturity." She rubbed her forehead.

"We can look it up later for you. We can both learn about it," Alex said. It would give Kara an excuse to fly them to the Fortress of Solitude and Kara would love that. Sure, they were not supposed to do it, but sometimes the rules were made to be broken, especially if it gave Kara some peace.

Kara grinned, her bright expression lighting up the night sky. She loved being able to share Kryptonian culture and her dunderhead cousin was not interested. Alex was very much interested.

"So, puberty?" Kara asked.

"Right. So, humans start puberty, which is the body changing as humans sexually mature. It usually starts at about twelve or the early teens. It ends with presenting. Humans can be alphas, betas, or omegas."

Kara's face was blank. Those words meant nothing to her. Alex blew out a breath. She thought back to her seventh grade health class, trying to remember about how things were explained in simple terms to make sense to pre-teens who might have never heard about any of this stuff. This might take a while.

"Wanna go inside? I'll explain and make hot chocolate," Alex said.

Kara let out a chirp. "Yes! I want whipped cream, marshmallows, sprinkles, and chocolate syrup."

"I know how you like it. You better hope Kryptonians don't get diabetes. Come on, sunshine."

-8-8-8-8-

Alex thought she would be happy to have her room back to herself. She had space for her desks, her books, and even her mini-lab again. She had missed all of those things when space was made for Kara. Now, she missed Kara. A knock on her door made her pop up from her bed. Kara! Probably not. Kara would not knock.

"Come in," Alex said.

Her dad stepped in with a smile. "Hey, good job with Kara again. She finally seemed okay with moving into her own room."

Alex shrugged. She had not done much, beyond repeating every single sexual status lesson she had ever had in her life with hot chocolate on tap pretty much. Well, and after her parents had gone to sleep last night, let Kara fly off to the Fortress of Solitude to ask some questions about Kryptonian sexual maturity. The information was in her ship and Clark had taken that "for safekeeping." The big idiot knew he was cutting Kara off from her culture, thinking it would help her learn American culture faster. He was such a fucking tool. Never meet your heroes.

"She didn't understand what was happening, even though we thought she did," Alex replied.

Jeremiah nodded. "We've got to watch that. Sometimes, she's still like a five year old, even though she's a teenager."

"Yeah, she was better once she could relate it to something from Krypton. She likes to do that." It was good for Kara to do that. She should not have to forsake everything she ever was to fit into Earth like that douchebag Clark thought.

He nodded again. "Did she tell you what age they present on Krypton?"

"They don't." Alex shrugged. "They're pretty much betas."

He chuckled. "Lucky them, huh?"

Alex nodded. Puberty sucked, but presenting sucked even more. The pain as her body shifted and morphed was nothing like she had ever experienced and she felt like she experienced a lot in her short, athletic, active life. She had been irritable and grouchy months before as her brain started producing more hormones. She had been physically ill several times and like her muscles and bones had been broken and reformed. She still felt off balance and was expected to feel that way for even longer. And, of course, eventually her body would go into rut, which would suck even more, as she understood it anyway. This whole mess was why she got her room back.

"Yeah, but that's why she's so confused. I guess it's good for you and Mom. You don't have to go through it a second time," Alex said. They did not have to worry about Kara in that way, and she included herself in that. The thought of alphas sniffing after Kara or omegas throwing themselves at Kara made Alex want to growl, but she managed to hold it in. Where the hell did that feeling come from, though?

Her dad laughed and mussed her hair. "Good, so we can concentrate on screwing you up. We don't know a damn thing about raising an alpha."

Alex laughed, even though it was true. Her parents were betas. Beta parents tended to have beta children. Alex, having proven herself to be more of a problem child than she recalled, seemed to be the gift that kept on giving. It was to the point her mother tended to focus her energy on Kara while giving Alex disappointed looks and comments when she did something wrong. At least her dad tried.

Of course, in trying, he had suggested Alex get her room back for "privacy." He basically thought she needed some place to whack it. He never out right said it, but much of his argument seemed to be he thought alphas had raging boners all the time and she needed some place beyond the shower to handle that. It was gross, and she hoped untrue. She did not want to lose all of her free time to masturbating. But, Mom and Dad are scientists and they wouldn't be worried about me needing privacy if it wasn't a real concern. She was not looking forward to this, especially since she shared a house with someone who could see the through walls and hear pretty much everything on the planet.

"Well, I'll leave you to it,'' Jeremiah said and Alex winced. She did not want him to go yet. Surely she would not get any raging boners with her dad around.

"Hey, wanna help me set up my computer? I've got a lot more desk space now." She motioned to her desk. The computer was pretty much set up, but hopefully her dad would go along with it.

Her dad, being the weird angel he was, stepped over to the computer with her. For a while, they both pretended, but then science caught their attention. Now, things were real and they had a good time together, as they often did when left to their own devices.

It was not until later that night, when the house was supposed to be asleep, was Alex haunted by the quiet of her room. The quiet did not last long. The door creaked open and Kara popped in like a little elf.

"Alex," Kara said.

"Yeah, I'm right here," Alex replied from her bed.

Kara wasted no time lying down next to Alex. "It's weird not having you across from me." She frowned. "I don't like it."

Alex chuckled. "You are such a loser. You've got superpowers. You can hear me from anywhere on Earth and see me through walls."

Kara grinned. "But, I can't feel you with walls in the way."

Alex put her hand on Kara's heart. "Liar."

Kara's grin grew. "It's a different sort of feeling. Anyway, I'm going to sleep now." She snuggled close to Alex, even though she was not under the covers.

"I'm not sure Mom and Dad would like that."

"Why? It's not the first time."

Yeah, but at the time I didn't have a penis. I wasn't about to turn into a sex-starved, crazy alpha then. Kara still did not seem to get it. "Kara, would your parents have been okay if you shared a bed with a boy?" They had learned Kryptonians had two sexes, male and female, without having to worry about alphas and omegas in the mix.

Kara's face scrunched up. "I dunno. You mean, like if we were both sexually mature, as you are?"

"Don't say it like that."

Kara tilted her head. "Krypton had a different view of sex than your culture if that's what you're getting at. Is that really why I had to get my own room?"

"No." Alex did not think her parents worried about them doing anything together. Okay, Mom might think something could happen, but more because of me probably. "I think they're more worried about us waking up in the morning and you seeing me pitching a tent." That was definitely a household worry. Alex would be beyond embarrassed.

Kara's face managed to become more pinched. "Pitching a tent?"

Alex blew out a breath. "You have to pick up on slang. I don't wanna say it."

Kara shook her a little. "Say it."

"They don't want you to see me with a hard-on or something." Of course, Kara could see through walls, so the whole thing was really moot. And with that thought, Alex was not sure if she would ever touch herself again. It was not really something she did anyway, mostly because Kara was around.

Kara's brow furrowed and she scowled. "A what?"

Alex groaned and put her hand over her face. "Sorry. An erection."

Kara's eyes went wide. That she understood. Her eyes drifted downward and Alex put her hands over her junk. Kara yelped and looked back at Alex.

"I'm sorry! I'm sorry! I'm sorry!" Kara squeaked as Alex put her hand over Kara's mouth.

"Shh! You don't want to wake up Mom and Dad, right?"

Kara shook her head. "I'm sorry."

"It's okay." Alex removed her hand and caressed Kara's cheek.

"I didn't mean to do that. It's just I don't understand this, even though you explained it and we read the books and we had the articles on the Internet. It's just on Krypton we don't suddenly change genitals." Kara scratched her forehead. It was hard for her to wrap her head around this.

Alex chuckled a little. "I get it. It's a little weird. A lot of animals on Earth are like Kryptonians when it comes to sexual organs and sexual maturity. Maybe humans are really weird. I really wasn't expecting it, anyway. I thought I'd be a beta. Probably better if I was. We'd probably still get to share a room."

Kara giggled. "You want to share a room with me now?"

Blowing out a breath, Alex shoved Kara. "Shut up. You've just grown on me, ET. Like an alien fungus."

Kara laughed. "But, you didn't want to be my bond mate."

"Because that's not the way things work on Earth and we're both too young to get married."

With a snort, Kara rolled her eyes. "You only say that because Earth is primitive."

"Yeah, name calling is so superior."

"Well, maybe if you weren't currently studying math I learned by the time I could walk, I'd say something else."

Alex chuckled. "You think Earth is primitive until you want funnel cake."

"Okay, so that might possibly be the greatest thing ever. Okay, no, any form of fried dough. Earth is a master of frying dough. Light-years ahead of Krypton."

Alex could not help laughing. They talked until they fell asleep. Alex was up first, which was not unusual. While Kara got superpowers from Earth's sun, much like having an over the top metabolism, she also slept like the dead for the few hours she was out. It was probably her body taking a break from all of the stimuli. And Alex was grateful Kara knocked out so hard because Alex had morning wood. Shit! This was embarrassing even if Kara was asleep. Definitely good that I have my own room now.

Kara shifted and pushed against Alex, pressing her ass against Alex's pelvis. Alex groaned and almost bit her tongue off to keep her hips from jumping. Taking a deep breath, Alex eased herself out of bed and made a break for the bathroom.

Taking off her pajama pants, Alex was not sure what she expected to see, but it would have been weird regardless. She had barely had her alpha parts for a week. She had not seen her cock erect. It was… kind of ugly. Were all dicks gross, discolored, and veiny? What if there was something wrong with hers? She had a doctor's appointment earlier that week and she made it seem like everything was fine. But, still… her penis seemed weird.

Alex reached down to touch her dick, but hesitated. Why the hell was it so big? And did all erections hurt like this? She did not know, but she needed it to go away. And maybe never come back, especially not when Kara's sleeping next to me!

She took a deep breath, looked away, and touched herself for the first time since growing a penis. She hissed as her body was overloaded with sensation. Wow! Okay. She did not know how her entire body had not imploded from the feel.

Getting a comfortable grip, she stroked up and down her shaft with an uncontrollable moan. She slapped her free hand over her mouth and continued on, unable to stop. Her body felt ready to explode with only a few moves of her hand. And then she did explode… everywhere. Shit!

Alex felt euphoric for all of a second before she realized she would have to clean the bathroom with bleach or Kara would know something went down in the bathroom. She might not know what, which would lead to questions, questions directed at Alex. Fuck. This was not worth it.

She was about to get to cleaning, but something weird started happening down there. With a groan, she buckled over. Oh, fuck. That's the knot I've heard so much about. Gritting her teeth, she exhaled through her nose as she ejaculated more, splashing on the floor as she felt her knot growing. Fuck, this is a mess. And, of course, since it was her life, it got worse.

"Alex?" Kara knocked on the door.

"Don't come in!" Alex almost tripped over herself to start the sink. She looked around frantically for something to clean up with. "I'm fine! Don't come in!" Don't x-ray vision the room, please!

"You sure?"

"Don't come in! Don't come in!" Fuck. Fuck. Fuck!

-8-8-8-8-

Kara sat at the kitchen counter as Jeremiah flipped pancakes like he did every Sunday for a family breakfast. She used to question this tradition. She liked it, not just for the pancakes. It also promoted family togetherness. It reminded her of her family. It also reminded her that this was her family, as weird as it was.

"Spent the night in Alex's room, spud?" Jeremiah asked. It was casual, so she did not think she did anything wrong.

Kara wrapped her arms around herself and rubbed her elbows. "It's weird to have my own room again. I can't really explain it, but it was lonely. She didn't mind." That felt important to say. She was not encroaching in Alex's personal space. She was allowed there.

He nodded, but focused on the action in the pan. "I know this is a shock to you and Alex told me you said Kryptonians don't go through presenting…" He trailed off, expecting her to fill the void.

Kara shook her head. "We don't. Alex explained. I got it." She also felt it. I wonder what it looks like.

"Okay. I just don't want there to be a misunderstanding."

"Nope. Got it. This won't be like when I thought me and Alex were married." That also felt important to say. They had all been upset with her over that and she had feared they would send her away. She was not sure where they would send her, but she thought it would be worse.

Jeremiah laughed. Kara still did not think it was funny and it happened more than a year ago when Kal-El left her with the Danvers. It was really Kal's fault, but he never admitted to it. If he bothered to learn Kryptonian culture in even the smallest amount, he would have known what he was doing.

"He said I was joining your House. That means getting married, becoming bond mates and Alex was the only one I could be bond mates with. I wasn't trying to cause trouble," Kara said.

Jeremiah chuckled even more. "We know. We know. That was just hapless on your cousin's part."

"What are we laughing about?" Eliza asked, shuffling into the kitchen, clad in pajamas like the rest of them. She and Jeremiah exchanged a quick kiss and then she offered Kara a smile.

"Remembering back when Kara thought she was married to Alex," Jeremiah answered as he plated another flapjack.

Eliza snickered as she poured herself a cup of coffee. "Poor Alex was so freaked out." They made it seem like Alex was the only one, but they had barked at her quite a bit before things were cleared up. Eliza looked around. "Where is Alex?"

"The bathroom," Kara answered. She peeked a little when she heard the noise, but she saw Alex's pants down and she managed to turn away. But, she wanted to look again. She was not sure why, but she wanted to see Alex. Maybe I still kind of feel like were married. Even though Kara knew she had a lot to learn about being married, both as a Kryptonian and an American. If not that, maybe she wanted to see for science purposes. What did a female alpha look like? The sight might help her better understand humans alpha, omega, and beta sexual statuses.

Eliza made a noise. "Maybe you should try to get used to your room, Kara. Let Alex have a little privacy."

Kara fought down a blush. "I will." She understood what they meant thanks to this morning. "It'll just take some getting used to. Alex is my rock." Alex was more than that. Alex was her sun, but she knew better than to say that.

Eliza nodded. "We know. But, think of it like when you got used to going to class without Alex."

Kara nodded. That had been scary. School had been a lot just from all the people and noise, but added to that she could not have Alex with her every moment was even more frightening. Alex always knew what to do when things became too much and not having her when things were already too much made Kara want to flee, cry, and breakdown in every way. But, as always Alex had her back. Alex took her by the shoulders, told her to listen to her heartbeat, and focus on that whenever everything became too much. It worked.

Eventually, Alex made her way downstairs, definitely not well rested. Her hair was ruffled and there were lines under her eyes. No one said anything, but Kara could hear poor Alex's heartbeat. She needed a distraction.

"Are we doing movie time after this or game time? Me and Eliza need revenge from your cheating last week at Pictionary," Kara said before the adults could figure out why Alex appeared ready to throw up and die.

Jeremiah laughed and hit the edge of his pan with the spatula. "We didn't cheat. You clearly haven't seen Eliza's scientific sketches."

"Hey!" Eliza huffed, but there was a smile on her face.

"Don't worry." Jeremiah kissed her cheek. "I love you in spite of your sketchy sketches."

"Hey!" Eliza laughed and shoved his shoulder.

Crisis averted. Alex gave Kara a smile and they had pancakes and omelets together. Then, they watched a movie, probably because Jeremiah and Alex got called out for cheating. A board game would have to wait for that to fade, not that Kara cared. For family movie time, Jeremiah and Eliza always took the couch while Kara got snuggle with Alex on the floor.

Despite the adult Danvers insisting otherwise, this certainly felt like what a bonded couple would do, but Kara did not say anything. Over time, she learned that there were some things she should only share with Alex, but even this she kept to herself. Alex had been too insistent about them not being mated when it all came out. Too bad she spent much of her time acting like Kara's bond mate, even when she was angry over Kara's existence. She was distracted from her thoughts by Eliza whispering to Jeremiah.

"Are you sure this okay?" Eliza asked.

Jeremiah scoffed. "They're fine. You know Alex only wants to take care of Kara and Kara's not interested in what's happening with Alex beyond wanting to understand why they can't share a room anymore. They're fine."

Kara was not sure what that meant, but she glanced over at Alex. Alex was caught up in the movie. She must have felt Kara's eyes on her as she turned and smiled at Kara. Kara smiled back and Alex offered up the bowl of popcorn. Kara glanced down to grab a handful of the snack and happened to glance at Alex's lap. She had a feeling Eliza's worry was because of Alex's change, which only made Kara more curious.

Alex smelled different for sure. She was still Alex, but there seemed to be some added spice. It clung to the roof of Kara's mouth and made her mouth water, similar to good food, but not exactly the same. Why? What was different? Kara wanted to find out, but could sense she was not supposed to. She did not want to upset Jeremiah or Eliza. She would do her best to be good.

-8-8-8-8-

Next time: being responsible is hard.