Alex has a Supersister, and I had a super Beta Reader. MarvelDC31, you were so kind fixing my bad English, criticizing and giving great suggestions. You're the best. Thank you.

I hope you like to read it as much as I liked do write.

Fasten your seat belt and enjoy!

Disclaimer: Supergirl belongs do DC and CW.

"The only problem with planning is that things never happen as they were planned to happen." (Lúcio Costa)

Survival of the Fittest (*)

Chapter 1 – Up, Up and Away!… and Down (**)

Alex's birthday was coming, so Kara was very excited. She imagined finally—after years of attempts—being able to surprise her sister by celebrating in advance. Friday and Monday would be holidays, so there would be, including the weekend, four days to execute the perfect plan that basically consisted of spoiling her sister as much as possible. It will end with a small surprise party with friends, on the right day.

"It's 6 AM and it's a holiday," a sleepy Alex opened the door.

Her sister really liked to try to surprise her on her birthday, but every year she did the same thing. However the agent couldn't expect that this year she would do it days before the correct date. Early in the morning she came to Alex's apartment bringing donuts and lattes.

Alex continued, "And you know that my birthday will be only next week."

"You always wake up early. Besides we have a lot of things to do. Now sit down and eat. Wait, I'm sorry, I didn't even ask if you had another plans. So… do you?" Kara questioned.

Alex laughed. It was impossible to resist the alien's excitement. She took a donut while she drink the coffee. Her sister did the same.

"No! So, what are you planning, Miss Danvers?"

"A lot of surprises this weekend." Kara gave her a gift, "Happy birthday in advance!"

Alex put the box on the table, ripped the paper off, and opened it. She took hold of the fabric, revealing the black jacket with a relief printing on the right side of the chest. The House of El.

"Kara, it's lovely!" She was touched, "I know how important this symbol is to you."

"You're not only a Danvers, Alex Zor-El."

Alex didn't hesitate to give her sister a strong hug.

"Now leave the sentimentality behind and enjoy. Get dressed. Comfortable clothes and the jacket."

After a quick shower the agent chose mesh black pants, a beige t-shirt, and sneakers. When she came back to the living room she saw her sister with a radiant smile in her Supergirl suit, holding out a hand.

"Come on, Alex, let's fly!"

With the breeze touching lightly on her face and feeling safe with the hero's right arm embracing her waist, Alex closed her eyes, enjoying every single moment. She had almost forgotten this unique and extraordinary sensation. Kara smiled, observing her sister's happy look.

"How about we speed up? Take this, you will be more comfortable." The alien gave her sister safety glasses that the agent used at the shooting range "Ready?"

"Always."

Kara accelerated and Alex felt the sensation of being back in her childhood.

"WHEEEEEEEEEEE!"

"Are you hungry?" Flying over the ocean, they were almost swallowed by the clouds.

"Starving. Do you have a pizza hidden in your cape?"

"Nope. But we can stop and buy some. I brought my credit card."

After a few minutes, Alex felt that something wasn't right.

"Kara, what are you doing?"

"Flying... we're going to buy food."

"Could you stabilize a little bit? Not so many ups and downs."

"What are you talking about? I am in cruising speed. More stable is impossible."

"You're speeding up and going down!" Panic quickly settled into the agent.

"I'm going up!"

"FALINGGGGGGGG...!"

Only then did Kara notice the land fast approaching. There was no time for any maneuver that could avoid the inevitable. As fast as possible she hugged and protected her sister, rotating her own body to fall on her back. Then, she heard a strong thud, feeling herself hitting the ground extremely hard.

Author's Note:

(*) "Survival of the fittest" is a phrase that originated in evolutionary theory as a way of describing the mechanism of natural selection.

(**) The phrase "Up, Up, and Away", originated on radio to indicate to the audience when he was taking off, in Superman earlier cartoons and comics. A song recorded for the first time in 1967 says: "Would you like to ride in my beautiful balloon? / Would you like to ride in my beautiful balloon? / We could float among the stars together, you and I / For we can fly we can fly up, up and away…" (Jimmy Webb)

TO BE CONTINUED...