AU- My take on what if there is another Danver's sister that Alex and Kara never knew about. This idea has been in my head for a long time. I know there's other fan fiction Au's like this but I never read them so if they are anyway near the same, there was no copyright intended. ( In this story Monel is still not on Earth after the Daxamite invasion and Sanvers are engaged).

Chapter 1

A girl walked into The DEO. She didn't check into security she just walked right in. She sees people walking around and people typing away at computers. As she gets closer she is noticed by one of the agents.

" FREEZE!" J'onn shouts as he points a gun towards the girl as do the rest of the agents.

" Whoa, Whoa, don't shoot please" the girl begged almost daringly.

"Stand down" J'onn ordered. J'onn knew she was probably harmless but as director of The DEO, you can't trust any outsider.

The girl got down on her knees and put her hands in the air.

" What are you doing here?", Alex questioned.

" I'm looking for a Jeremiah Danvers", the girl replied.

"Why?", Alex questioned aggressively.

" He's my father", the girl replied.

Alex lowered her weapon in shock looking over at Kara who was looking back at her with the same face of complete shock and confusion.

" Arrest her now and bring her to a cell", J'onn barked at two agents.

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" You know last time I checked I wasn't an alien so I don't know why I'm being held hostage like one" The girl said from the inside of her cell. J'onn, Alex and Kara looking at her on the other side.

" Oh shut it", Alex snapped back.

"Alex", J'onn said giving her a daring look.

" Who are you anyway?" Alex asked in an angry tone

The girl opened her mouth ready to answer when J'onn interrupted her-

" Her name is Jessica Danvers. She's 18 years old and is from Midvale. Alex….when you were ten years old your father had an affair with a woman who didn't live to far away from you. It didn't last long but Jessica here is the result."

"What?", Alex whispered in shock.

" Oh so you're Alex?" Jessica sneeringly asked. " Yes i heard all about you." Jessica then points to Kara who is in her Supergirl outfit, " I'm guessing you're Kara yep I heard all about you too… I would shake your hand but you know you're kinda holding me hostage as if I was the alien"

" How do you know she's Supergirl?" Alex asked and you could hear the anger in her voice.

" Oh you know Jeremiah.. Well Dad ..ha… well he told me that one of his daughters was from Krypton…..and relax I never had any friends to tell anyone so.."

" J'onn….you knew about this?", Alex asked the betrayal visible in her voice.

" Don't take this out on me Alex…. Eliza knew about her too".

Alex didn't know how to react.

" Jeremiah used to visit me a couple of times a month… you know he gave my mother money and stuff until he disappeared. I heard a rumour that he was back...came to see was it true."

" Yeah he came back for a while but he's gone again", J'onn replied.

" Oh so he came to his two other daughters but not me?" The hurt was clear in Jessica's voice.

" Oh shut up you're not his real daughter and nor are you my sister"-Alex started but Kara interrupted her-

" Alex wait-"

" No Kara just…. You know what Jess or whoever you say you are get out"

Alex opened her cell door and shoved Jessica out of it.

" LEAVE", and with that Jessica stormed out The DEO.

" I want a DNA test and for her to never come back no matter what the results are", Alex ordered at J'onn.

"Alex wait.." Kara begged but Alex was already out the door.

So yeah that's chapter one. Should I keep writing? Please let me know. If you have any feedback or requests please comment.