Disclaimer: I do not own any characters made by DC Comics, this includes Batman, Superman and their respected families as well. As for any characters not in the DC Universe, there probably mine.

Advisory: This is not a Slash pairing, if I was going to do that, I'd probably never show it to the public out of embarrassment.

Author Note: Before I start writing like a mad man, I'll putting this straight. I've not read the full fledged History of Supergirl, I don't know the predecessors of the mantle of Supergirl and personally, I really don't want to bust my butt trying to hunt down all that history. I just read Batman/Superman: And I think I'm pretty much up to speed in my opinion. As for Batgirl, don't be worried, I'm a lot more well read into her history because there's a tad bit more there. But I'm not aiming for too much continuity other then both the characters pasts.

Batgirl/Supergirl:
Perfect Pairing
Chapter One: A Long Discussion about a Bad Idea

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The Batcave: 2:45 A.M.
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Bruce Wayne or to the Caped community, Batman sat at his computer silently working on a case. With Robin and Batgirl in Bludhaven and Alfred preoccupied with dusting off the 84 seat Table, Bruce had a very long time to work by himself. The whoosh ruined his night, if every night weren't already bad to begin with.

"Clark, I told you I hate it when you do that." Batman said rudely, not bothering to even turn around to give the Man of Steel any respect.

"I just came up with an Idea Bruce, and I think you might like it." Clark Kent, A.K.A. Superman, said smiling that award winning grin of his.

Batman gave him a smug look, ever since Supergirl came, Supes has had more spring to his step, especially after she decided to join the Hero Community.

"Alright, what's your Idea." Batman said rolling his eyes behind the mask.

"I saw that," Superman replied, "Anyway, You have Batgirl right?"

"Yes, she's in Bludhaven doing a fantastic Job cleaning the Penguin's outfit out of the city." Batman replied, he had a pretty good idea where this is going, but he gave Clark the benefit of the doubt, praying he was wrong.

"Well, pull her out of there," Clark smiling wider, "Because, if you and me can work together and Superboy and Robin can work together, then I believe Supergirl and Batgirl should at least try and work together." He finished.

"Not a chance in hell Clark." Bruce snapped back, "Reason 1, Supergirl is almost untrained minus her short stay with the Amazons. Reason 2, Cassandra is doing perfectly fine on her own and doesn't need a partner. Reason 3, Cassandra is having a hard enough time as it is, same with Supergirl. Pairing them up would only hamper them."

"You just don't want Batgirl getting distracted again by another fri..." Clark stopped, he knew he'd crossed a newly etched line in Batman's record. Spoiler, the poor girl who lost her life in the gang war. Clark lost the smile.

Batman actually turned around now and stood up and faced Clark, "Give me a Reason why. A good one, and don't go and say they should try it and if they like it continue, I want a solid reason."

Clark stared at Bruce for a long second, their eyes seeming to pierce each others like daggers. The two greatest heroes the world had ever seen, were locked in a stalemate on why and why not.

"If Batgirl is the top tier of training and focus and Kara is just looking for people she can get to know and is lacking the strength, the two then compliment each other's strengths and weaknesses." Clark said, the words seemed to drive themselves into Bruce's body like a car wreck.

He looked down at the ground trying to come up with counter point and rolled over one and only one, "Cassandra isn't a good Detective."

"She'll learn, now quit being a sore loser Bruce and call up Batgirl." Clark said knowing he beat Bruce at his own game.
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The Batcave: 3:30 A.M.
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A rather tired Supergirl yawned as she lazily flew into the Batcave. Her cousin, Kal-El or Superman to the populace, stood like a stone wall on one of the platforms. She might've been drowsy but the Cave being colder then the bare end of Space seemed to do a fine job of waking her. Should've picked a less revealing outfit that had more cloth to it. Her X-ray Vision spotted another Mass hiding in the shadows but it wasn't Batman, it was a smaller frame and with a lot more grace.

"Hello." She said yawning.
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The Batcave: 3:31 A.M.
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Cassandra's eyes widened behind her mask, how did she see her! She was complete enclosed by the blackness of the cave. No way, she had to be Supergirl and she cheated, she used her ray vision or something. Slowly she climbed through the shadows making no sound that she could hear. Her eyes were stuck on Supergirl if that was her Hero name she didn't care. When she landed on the platform in front of Superman, Cassandra frog hopped from the wall making no more sound then a leaf falling to the right of the both of them.

She walked over to Superman and stopped five feet away; his reach was about there and she could dodge at the first blow. He might be the great Superman but she trusted no one, well no one except Batman. He told her not to trust others though because you had to wary of everything.

"Ladies, I've brought you here to this cave for a reason." Superman said in that voice full of glory.

Supergirl rolled her eyes, "Kal, you woke me up at this ungodly hour, I know you want to give this great speech but please, give us a summary because I really would like to get back to my bed before it gets cold."

Superman sighed, she had a point, it was 3 in the morning, "Alright, Kara, me and Batman, whom is brooding upstairs in his monstrosity of Mansion still trying to come up with a counter point to this, have decided that because the two of you seem to be lacking we're suspending you from hero work." Cassandra folded her arms, she could see through that lie a mile away, Supergirl on the other hand, fell hard.

"You're not serious!" Supergirl shouted, "You can't make me quit!"

Superman held back with everything he had, "Yes Kara, you're quitting."

Cassandra almost felt for the Blonde, almost, but she would like to One-Up the Man of Steel just once, because you might not have another chance.

"He's lying." Cassandra said taking off her mask.

Supergirl looked over slowly, Cassandra could tell she got over this quick and her emotion was seething vengeance, "What..."

Kal looked from side to side quickly, he remembered her being a Mute, "You can tell. The way he... shifted and his look." Cassandra said picking him apart.

Kara looked up at Superman with a balled fist, "Oh you dog... I oughta sock you one to take back to My aunt. Or you could get to the point and I might just let this slide..." She said quickly thinking her tone to that of Batman's.

Superman smiled, they worked well together, he thought, "Me and Batman have decided to pair you two up to work as a team and try and learn from each other."

Cassandra again made no flinch and Supergirl again was shocked and amazed, Cass could tell it was half and half, good and bad.

"You mean me and her working together." Kara repeated pointing at Batgirl, "That's the stupidest idea I've ever heard."

"Agreed." Cassandra said.

Superman who was put off slightly by the two heroines comments on his idea, "Just give it a shot and see how it works alright. If you don't like it then you can quit but please try for me."

Those baby blues and that spirit of his, both Kara and Cassandra damned it. How could they say no without having a guilt trip worthy of a bottle of Tylenol.

"Okay..." They both said in unison.

And just like that, the two Heroines were going to begin an adventure that neither would forget.