-Took a bunch of tips from the comments on part 1 :)-

Reverse Damian = Older Damian/Dami

Reverse Tim =  Older Tim/Timmy

Reverse Jason = Jay

Reverse Dick = Dickie

"JAY!" Dickie cried, kicking off the medical table and staggering to his bother as soon as he hit the ground.

"Dick!" The fourteen yeah old exclaimed. "He got you too?" The eight-year-old gripped Jay's stomach as tight as he could for safety.  "UGh, Off! You're gonn' make me puke!" The teen forced the child off him. "Bruce! Who is this guy?" He gestured at Jason.

"You know him?" Jason gaped. "What, you wanted a younger-looking version of me? Fuck you!"

Bruce stared down the kid in the tan jacket. He did look a bit like a Robin dressed as a red hood, but it was unmistakably his second son.

"Jay?" Dick asked, beating their father to it.

"Yeah, What?"  Both grunted, they turned to scowl at each other.

"Who is this creep?" The younger exclaimed. "He jumped me, tied me onto his lame-ass bike, and brought me back here!"

"Yeah, cause I don't like little kids dressing up as me, and playing with guns they don't know how to use!" The older spat.

The younger teen looked offended. Dickie gripped him for safety. "Get off!" Jay whined; his little brother was cramping his style. "Dad! Make him leave me alone!" He shouted at Bruce.

Bruce wasn't sure what to do, Jason wasn't supposed to be older than Dick! This wasn't right. "Dick. Come here." He said gruffly. The child shuffled further behind Jason.

"Jay!" Dickie Squeaked, not wanting to leave his brother.

"I said get off! DAD!"

Bruce tried again, but Dickie was too intimidated to obey. Jason was going to be obnoxious about this... 
He put on a higher, child-friendly voice. "Dickie, can you come here please?"

The child slowly melted out from behind Jay, and stumbled over. Dickie put his arms up, and Bruce lifted him off the floor, resting the child on his hip.

"Another one?" Jason asked. "Another Robin? Named Dick? Goldie 2.0? You're just doing remakes now!"

"Dick, explain." Bruce told his oldest, adjusting his grip on the little boy.

"We think it's an alternate universe collision: In their universe our ages are reversed."

Jason turned, appalled, to Jay. "So he's-"

"Also Jason." Dick nodded.

Jay frowned. "What? You're old me? You're a loser!" 

Jason rolled his eyes. "And you have the right to insult me when you're just a pint-sized alternate universe clone?"

"How do you know OUR universe isn't the real one, and YOURS is the reverse one?" Jay gloated.

Jason scoffed, grabbing the kid by his shirt collar. "Listen up, squirt, you're in OUR universe, you're gonna listen to US."

"Okay Burnout!" Jay stuck out his tongue, flipping his senior off.

"Jason." Their father warned sternly. Bruce was surprised that he'd reverted to that,  it had been about four years since He'd had to deal with Bratty, baby Jason.

"What?" Jason snapped.

"Not you!" He jerked his head at Jay. "Jason, stop it!" He felt Dickie tense up a little. "Shh. It's okay, Dickie. I'm not mad at you." He cooed to the young boy.

"Why are you talking like that?" Jason laughed.

Bruce ignored him. "I'm going to put you up here again so you can see. Okay?" The eight year old nodded, and was set atop the med table again.

"Is that how he used to talk to you?" Jason asked his big brother.

Dick rolled his eyes. "That was forever ago! I was like this! I couldn't even speak English yet!"

"Judging by the email you sent earlier, you still can't!" Jason snarked, shoving his baby-version out of his bubble.

Bruce turned back to them, dropping the baby voice He used to calm Dickie. "We need to tell Tim and Damian, their doubles are probably also around Gotham."

They heard the ground-entrance to the batcave glide open, followed by footsteps, a dragging sound, and shouting. 

"FATHER!" 

"FATHER!"

Bruce groaned, this was about to become one hell night.  A strange man backed into the room, struggling to drag Damian in after him. "FATHER!" The man ordered, Dropping Damian at his feet like a cat that dragged in a dead bird.

"How did he get into the batcave?" Damian ordered. "You said you told me EVERYONE who knew the entrance codes!"

The man stared down at Damian. "He did. Keep up."

"You don't know what you're talking about." Damian spat, picking himself off the floor. "No one would steal a nightwing suit and walk into batcave! How stupid are you?"

"Not stupid enough that I haven't figured this out yet, Damian Wayne." The man glared at Damian, actually shutting him up for a second, from shock alone. 

"Let me guess, Damian?" Bruce sighed.

He nodded. "Dimensional collide. are we in yours, or are you in ours?"

"You're in ours." Bruce said. "Your ages are inverted from our universe's Robins." He nodded.

"What's happening?" Damian ordered. "You know him? Why don't I know about this."

"Catch up Demon spawn! He's alternate- universe you!" Jason shouted, as if he hadn't just found out five minutes.

Older-Damian's eyes locked on Dickie, where he sat. "Richard!" He raced to him.

Dickie saw his brother and squealed. "DAMI!" He put up his arms, letting 'Dami' pick him up.

"HEY! What am I?" Jay demanded.

"Oh, Todd, they found you too." Older-Damian stared uninterestedly at the kid. "Oh well."

"So that's why he kept saying I'm not the real Nightwing!" Dick realized. "The Nightwing he knows is Damian!"

Older-Damian turned to Dick, holding the eight-year-old securely. "Are you this universe's Nightwing?" He asked. "Richard?"

"Yeah." Dick said. 

"What made you Nightwing?" Older-Damian asked. "You're Father's favorite." He adjusted how he was holding Dick. "You're the perfect Robin out of all of us."

"I can tell you I wasn't." 

Older-Damian looked down at Dick, they were the same age, but Damian's birthday was before Dick's, making him technically a year older than this Nightwing. But he didn't need that as an excuse to look down on him. 

He was Dick Grayson! Dick Grayson was a baby! He was Bruce Wayne's perfect little Robin! He was the innocent child Older-Damian held in his arms! This man before him was just the teary-eyed kid in a more matured-looking body.

Dami gave him a look, and turned to the child in his arms. "Richard, who's Robin?"

The child looked a little confused, and a bit shy around all these people. "Me?"

"That's right." Dami encouraged, giving the ghost of a smile, he played with the little boy's wavy black hair, making him pout a little in objection.

"Hold on! Grayson's robin?" Damian Ordered. 

"Yeah! catch up!" Jay told the kid impatiently, Kid Damian was SO much more annoying that grownup Damian, and Grownup Damian was already annoying!

"If we're all the same ages than he must be nine!"

"Eight." Older-Damian replied stiffly. "Like I'm older than your Richard, there's a gap between our birthdays."

"Still, eight! Why are you carrying him? You're treating him like an infant!" 

Dickie let go of his big brother's costume, tears glazing his eyes. He bit his tongue hard.  His brothers usually liked carrying him! Everyone always carried him at the circus...

"Maybe cause he's not a little shit like you!" Jay scowled.

"He's crying!" Damian pointed out. "How did you make him Robin? He's not Robin, he's a child!"

Several hot tears streaked down Dickie's cheeks. He leaned into Older-Damian's chest, hiding his face.

Jay felt anger fill his chest. He stormed over and shoved Damian. "His fucking parents are dead! Fuck off!" He shouted furiously, ready to fight.

"Yeah, what the fuck Demon? His parents died when he was eight!" Jason jumped in, always on board to bully Damian.

Dickie knew it wasn't normal for him to cry so much, and now someone his age had drawn attention to it. This was why Bruce didn't want him in school yet. Well, that and his trouble with English. 

Older-Damian glared at his child self, beyond angry. No one hurt his baby brother and lived, not even himself! 

"We need to tell Tim to keep an eye out for-" Dick started, only to be cut off by the other Nightwing.

"Don't change the subject." Older-Damian ordered, maintaining his glaring contest with his child self.

"I mean he-you-He's nine. He's you! Don't get upset that you insulted me."

"Stay out of this, Richard. You're confusing yourself." He barked, leaning over and grabbing his scruff, jerking Damian off the floor. "You're stupid. You're going to ruin your relationship with the only good brother you have."

"HEY-" The Jason's chorused. 

"You don't want to loose him." Older-Damian told him. "I had to be Robin for eight years before I got any siblings. And another ten before I got Richard. Be grateful you weren't The only child here, and after eight years, all you got was Drake."

Older-Damian set himself down. No one could be more mad at him than himself. NO ONE can take his precious brother for granted, none of them would make it without him.

"Tim?" Dick spoke into his comm. "This sounds insane, but there's a dimensional overlap, and you might see your ultra-dimensional twin around Gotham." He paused. "...We think. We aren't sure yet."
He listened to his earpiece intently, and turned to the rest of the group. "GUYS! The Tims have found each other."

"What's their location?" Bruce fixed his cowl. "I'll bring them in."

"That's the thing, they aren't fighting." Dick interrupted. "Apparently they figured this out way before us, they're sitting on the roof of the Church's Chicken, working to figure out what brought them here."

"Count on REPLACEMENT to befriend them, what a traitor!" Jason scoffed

 "I'll tell them to come in. They can use the batcomputer."

Bruce sighed. "Sure. The rest of you upstairs. Find them some clothes."

His sons erupted into protest at the mere idea of sharing clothes.

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"TIMMY!" Tim felt a fifty-ish pound weight smack his leg, almost tackling him to the floor.

"Uh, Dick?" Older-Tim reached across and peeled his little brother off his doppelganger's legs. "Wrong one."

Dick looked around, frowning up at the two. He decided that the Older-Tim was his brother. "TIM!" He grabbed Tim's waist in a bear hug.

"Hi, Dickie." He pat his little brother's back. He was dressed in a t-shirt and ill-fitting pants. 

"Those are Damian's clothes." Tim remarked. "By that logic, Jason should lend you clothes."

Older-Tim raised his eyebrows. "But would anyone ever want to wear Jason's clothes?"

His fourteen year old twin laughed, and they got back to work. "We can go home?" Dick asked, gripping his big brother. 

"Soon." Timmy assured him, not really sure if that was true. "It's pretty late, why don't you go find Dami?"

Tim looked over. "Alfred can set up another bed for you, if you go find him." 

Dick lit up, nodding excitedly. "Okay!" He skipped off up the elevator.