#—cass writings

[jnkangels]

If you're men or minor, do not interact with this content! I don't responsible for your media consumption.

English is not my first language, there maybe mistakes ( u can correct me, without being rude).

୨ৎ

I'm just thinking about how Sevika would want to fuck you all fucking night.

You were still lying on the bed, sweat dripping down your cheeks as you tried to regulate your breathing. The girl who left you like that licked her three fingers; savoring your essence.

"Honey, seeing you like this makes me want to fuck you again." She crawled towards you, brushing your hair out of your face so she could admire you as she caressed your cheeks.

"You're a complete mess, babe." Her thumb traveled to your bare nipple, beginning to massage it, a moan leaving your lips. You sat astride her, seeking to feel more of her soft touch, wet and desire-filled kisses spread all over your neck and down to your torso.

Sevika took the time to admire each place where she dispersed her kisses and light touches, her tongue began to trail along your abdomen until it reached your tits; She licked the areola and with one of her hands she took one of your breasts and took it to her mouth; nibbling and sucking your nipples.

Uncontrolled moans left your lips, your lover's other hand was pinching your other nipple. Their intimacies colliding shook each other making the heated experience even more stimulating.

"Do you want me to fuck you now, babe?" Sevika removed your breast from her mouth, roughly throwing you onto the bed again; Your head hit the mattress, she looked at you waiting for some kind of response.

You nodded at the question, longing to feel her touch again. She wasted no time and flipped you over leaving you face down, she lifted your ass leaving it exposed for her, she ran her fingers along the line of your pussy.

From one moment to the next she sticks her fingers into your pussy, drawing a surprised moan from you; Their movement was aggressive and fast.

Her fingers kept piercing your pussy, going in and out roughly. Your eyes began to glaze over at the excitement you were experiencing.

“You sound so good, babe.” Sevika made a rough movement, grabbing your hair. "Am I being good to you? Do you like the way I'm fucking your pussy? I want you to cum for me, babe."

Ragged breaths and moans escape your velvety lips, as Sevika pounded even harder into your pussy. You could feel how close the orgasm was, you contracted your clit trying to retain the emotion of the moment; the effort was in vain. A loud moan escaped your lips as you felt all the current discharge from your body, Sevika's fingers left the inside of your throbbing and aching pussy.

"Aww, are you tired already, honey?" Sevika said with a mocking tone of voice as she looked proudly at the mess she had made.

"We still have a long night, babe."

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2024 © jnkangels | all rights reserved. do not copy, modify, or translate any of my works.

[non-binary-lil-star]

Hc all the batkids decide to give Bruce Happy Mothers day as a prank

. Dick comes up with the idea and gets everyone to sign a Happy Mother's Day card that he made

. Jason buys him a watch with a small card saying "Happy Mother's day, loser"

. Cass buys him a mug that says "Best Mother in the world" (Shiva will later find out and fistfight Bruce because of it)

. Tim makes a gadget that Bruce had projected but had no time to actually build, and leaves it on his desk in a small gift box

. Duke has No Idea how other people are going about the prank and decides to buy him flowers

. Damian paints Martha Wayne (Tim helps by finding him several reference pictures)

They all think they're going to make Bruce Very Uncomfortable. Because well, he's not a mother. He's their father. Guys, Bruce starts sobbing by the end of the day. He hugs them and won't let go. Plan sucessfully backfired.

[raynewolferune]

Batmobile Conversations as Heard by a Fast-food Drive Thru Cashier

Batman: "No."

Red Robin: "But what if -"

Batman: "No."

Red Robin: "But I could -"

Batman: "No."

Red Robin: "What if I -"

Robin: "Cease this Neanderthal behavior at once! You cannot be a Red if you are dressed entirely in Green!"

~*~*~

Red Hood: "You're not my fucking father!"

Batman: "The paperwork says otherwise."

Red Hood: "Fucking where, Bitch! I'll burn them!"

Batman: "You'd still be grounded and for even longer if you did."

~*~*~

Batman: "Please tell me you have a Signal action figure now?"

Drive Thru Cashier: "I'm afraid Riddler high jacked the truck they were supposed to be on. We haven't got any in yet."

Batmn: *long heavy sigh* " Of course he did."

~*~*~

Red Hood, driving the batmobile for some reason: "I need 10,000 of one of literally anything you carry other than the Night Wings. I literally don't carry what it is."

Signal: "And one order of Robin Nuggets."

Red Hood: "And one order of Robin Nuggets. We Are Robin limited edition version if you have it."

~*~*~

Nightwing, driving the batmobile for some reason: "I need 6 orders of Night Wings, please."

Red Robin: "There are only two of us? And I don't want Night Wings?"

Nightwing: "Nah, that just cause Hood's trying to steal my lead. I'll get you anything you want other than the Caped Crusader Sandwhich though."

~*~*~

Batman: "No, you may not borrow the Batmobile."

Robin: "It's a right of passage!"

Batman: "You are too young to have earned that right yet."

Spoiler: "Ha! He called you a baby!"

~*~*~

Spoiler, driving the batmobile for some reason: "Do you guys have any glitter?"

Drive Thru Cashier: "Ma'am, this is a fast food restaurant."

Spoiler:

Spoiler: "How many packets of ketchup, mustard, and mayonnaise can you legally give me?"

Drive Thru Cashier:

Drive Thru Cashier after checking with the manager: "50 packets of each."

Spoiler: "I'll take them!"

~*~*~

Robin, driving the batmobile clearly without permission: "I require 2 Robin Meals. One vegan."

Superboy the 2nd: "Oh! I want a Red Hood toy!"

Robin: "What?! Absolutely not! We will take the current Robin toy! A Nightwing if that's not available!"

Superboy the 2nd: "NOOO! I WANT RED HOOD!"

Red Hood, apparently in the back seat of the batmobile: "Dear God. MAKE IT 4 ROBIN MEALS, PLEASE, ANS GIVE THEM BOTH WHAT THEY WANT SO THEY SHUT UP."

Superboy the 2nd happily: "As long as I get my Red Hood."

Robin grumbling: "Ridiculous. Stop acting so thirsty for it."

Red Hood: *strangled, choking noises*

Superboy the 2nd: *mortified squeal* "ROBIN! That is NOT what that MEANS!"

[prlssprfctn]

Bruce and Jason, who accidentally fix their relationship in a relative secret and distance from the rest of the family (Alfred excluded, of course), and decide to keep this fact as a secret from the rest of the family, just for fun. Because, let's be honest, Bruce is no less a brat than Jason is, he is just better at hiding it the older he gets.

Dick, sighing: Listen, I am about to invite Jason to this family dinner. And I don't care if you want it or not! And if you try to sabotage this day by your moral code lectures, I'll have a word with you! Bruce, indifferent, while messaging Jason at the same time: Mhm.

(On the other part of Manor) Tim: Honestly, I am not giving you a choice here. You will come to this dinner, Jason. Just... just ignore Bruce, alright? Jason, dramatically huffing, while liking Bruce's messages: Yeah, yeah, WHATEVER! Alfred: ...My circus. My monkey. I shall stay collected, nevertheless.

Damian: Father had been disappearing after patrols lately. I can't track him... What do we think is going on? Is he found himself a new child he plans to adopt soon? We can't get another sibling. Tim: Relax. He is probably into a new woman. Or a man. Whatever. Dick, worried: Guys, what if it is another villain or rogue? Jason, with whom Bruce spends time after patrol by munching fast food on the skirts of town: ...Lol Damian: That's not funny, Todd. Barbara, who knows everything: ...It is funny. Dick: Babs!

Tim: You know, Jason had been surprisingly chill lately. I knew he was doing better, but he stopped avoiding Manor that much. Bruce, arching his eyebrows: Alright? Tim: Do you think... maybe you two can finally talk? And fix your mess? Bruce, who just came to the cave after reading session with Jason, hiding his smile behind a sad face: I don't know, chump. It is complicated.

Dick, calling Jason randomly: Urgh, B is such a bitch! Jason, gasping: Right? Tell me about it! Bruce, sighing from his side of the couch as Jason puts The Crown show on his television: ...

[metamatronic]

misc. sad doodle and follow up to this . poor cass had to watch her friends kill her dad and wasn’t sure if he’d even come back. oopsie. ¯\_(ツ)_/¯

[analviel]

Damian on an interview that irrevocably won the hearts of the entire world his reputation wil never, ever, ever recover:

So he's on a quick interview just a light one that's probably gonna be edited to 5 mins that involved sitting and talking, and -most importantly the reason he'd suffered through it- petting dogs. And they get on to his dreams and expectations of the future, and of course he says something about having established veterinary clinics and caring homes for animals, and then he's asked, personally what did he think he'd look like, what feature of your parents will you get and.

Damian answers height, definitely height, both his father and mother are tall people (he is going to loom over lesser plebeians he will not allow otherwise) and even Jason has proven it so there's an example and even Dick himself is tall, Duke is growing uo to be tall too, so the precursor is giving him a solid support to his theory, even if he might be of the slighter physique like Cass amd Tim they're still not what you'd call short just like mother and Selina, (here, the interviewer blinks as Damian so very seriously mulls on that, going on a rant of probabilities and likelihood and genetics), internally Damian feels very assured of himself because his mother also created him in a test tube and surely she'd give him only the best feature, he's not like his siblings who depended on luck and genetic lottery because it'd been rigged for him since the start Talia certainly did not and could not go that far okay so it's practically guaranteed that he's going to be tall and he's been bombarded by social media of exactly how beautiful his family was so there's no question about that.

Yes, Damian gets so heated and passionate about this..... That he clearly forgot one crucial thing about his supporting points here and that the interviewer refuse to bring up. His conclusion is surely sound and solid.

The facts he'd brought up to support that though.

Perhaps we have live reaction of his dawning realization and mortification.

Maybe, distracted by the doggos, he doesn't register this until much, much later.

Dick, Cass, Jason, Tim, Duke, and Steph (who'd maybe been included too in an aside regarding her lighter hair that had darkened so perhaps Damian should expect his dark brown hair, from Talia, to settle into something darker approaching his father, Tim, and Cass'), share the clip with a heartfelt if also teasing and half joking comments.

Dick: AWWWW😭😭😭😭💗💗💗💗 We're a true family little D

Cass:, 💘❤️☺️

Jason: Yeah, absolutely solid argument here, I agree. Take the height Tim and Cass didn't.

Tim: I'll never forgive you if you grow taller than me, but I'll forgive you even less if, on top of that, you also don't grow taller than Jason.

Duke: This is so sweet dude 🥺🐶

Steph: Anticipating you in the hair color changing club (current members: my platinum-dark blonde, Jason's red-black)

Bruce: You make me proud

I love the trope of forgetting that you're not related.

[grey-viridian]

Leonardo

I finished this comic about a month ago but couldn't bring myself to post it. It started as a simple illustration and then I just kept adding more and more and at some point I had to stop myself and cut the story short. I'm still not entirely satisfied with the result but... well. I like it. That's enough.

[gothamite-rambler]

While Batman and his kids were in the middle of an investigation in the afternoon, the cheerful jingle of an ice cream truck filled the air. The sons and daughter of Batman turned to see the truck passing by, and Damian was the first to take off after it.

Damian: Stop! Stop! I want ice cream, I've never been this fortunate! Come back!

Tim (running beside him): We can catch up to it!

Jason: I have money… I want ice cream! I can try to shoot the tires out!

As Jason followed his brother, Dick slipped away to join them, leaving Batman to analyze the weapon left behind by the perp.

Dick: I want the Spongebob pop with the gumball eyes!

The ice cream truck driver noticed the four heroes racing after his truck and perked up, stopping abruptly.

Driver: And my mom said ice cream delivery trucks in Gotham were dead!

As the Batboys rushed to buy their treats, Batman realized everyone but Cass was missing. He spotted her standing aside, waving, her mask-covered face hiding a smile.

Batman sighed, pinching the bridge of his nose in exhaustion.

Batman: Alright, guess we can take a break. Come on, Orphan; I'll buy you a strawberry cone.

Cass clapped happily as she and her father walked over to the truck, ready to join the fun.

[bluerosefox]

LOA and Ghost Cultures

Wanna know what.

Another Dead Serious prompt idea spawned.

Damian was League of Assassins raised we all know that so what if he takes ques on how to woo you're potential partner from those teachings.

And we get mainly outsiders POVs and think Damian is trying to kill or threatening one Daniel 'Danny' Fenton after the boy accidentally knocked Damian onto the ground via punch to the face (Danny was stressing hard that day, new school and had just gotten out of a fight with Vlad that night so he was running on little sleep)

Eventually the family (everyone but Bruce) get together to try to get Damian to stop his 'threats' and one of two things can happen.

Either they eventually bring it up to Bruce who at first is worried like the rest of them but then realizes what Damian is actually doing because he has the same experience from Talia's courting.

OR Babs warns them that Damian was spotted entering the Fenton home and seemed geared for a fight, they go running to stop Damian from maybe carrying out his plan, and stumble onto the two making out after a brawl.

[superbat-lmao]

Jason travels to an alternate universe where Bruce only cares about being Batman. He took in each of his kids to serve the mission, not be his children.

Now, faced with alternate versions of his family, Jason has to grapple with the fact that his Bruce does care, that he is his father. Because the man in front of him now, trying to send him home, isn’t even close.

[quadrantadvisor]

Even after learning their secret identities, the hero community always insisted that there was something inhuman about the bats. No one doubted that their intensive training had a lot to do with it, but it never quite explained how they could evade a Kryptonian's super senses, how they could melt into shadows, how they could function so long with little food, little rest, little oxygen if need be. Most people dismissed their uneasy feelings, but there was something strange about the bats, something uncanny, something that made them different from the arrows and other vanilla human members. And, slowly enough that no one really noticed, it was getting stronger.

Until one day, during a diplomatic meeting with the ruler of the Infinite Realms, when High King Phantom turned to Batman and his brood and literally brightened. "Oh! I didn't know you had liminal members!"

Or: through a variety of factors (proximity to death, their own death/near death experiences, exposure to the Lazarus Pits, the favor of Lady Gotham, immersion in Gotham's own cursed ambient ectoplasm, being a close knit group who continued to expose eachother, etc.) the batfamily have been becoming liminal/ecto-contaminated without noticing. The powers they're developing have been subtle, and align with the skills they expect to have, so no one brought it up when they started being able to hold their breath beyond human limitations, or got so sneaky that they literally seemed invisible, or had a lucky miss when they expected a bullet to go right through them. And they always exuded an unsettling aura of fear, so no one else thought anything was out of the ordinary either. By the time they meet Danny, Gotham counts as one of the most fiercely defended ghost haunts on the planet, with so many territorial liminals patrolling the streets.

[jnkangels]

I NEED U TO MAKE A CEO SEVIKA SO I CAN CONTINUE LIVING WELL😩😩!!!!!!

—I love your writing<3

Hi babe, I'm glad you like it<3!!

If you're men or minor, do not interact with this content! I don't responsible for your media consumption.

English is not my first language, there maybe mistakes ( u can correct me, without being rude).

୨ৎ

Hectic breaths and loud moans echo throughout the office, your head collided against the armored glass while the opponent's fingers played with your folds. The Rolex on her wrist screamed: Expensive! In the face of anyone who looked at it, the cold of the metal was close to your humidity; It made you shudder.

"Since you would like everyone to see how I'm fucking you right now, wouldn't you, my little flower?" She slammed your face even harder against the glass, the entire city could be seen from above, so much so that if you didn't were high enough someone would probably see them. She inserted two of her digits inside you, you arched your back at this.

"Answer you little scum, would you like everyone to see us? Do you like the idea of them seeing that you are my damn property? Come on, answer." She began a lazy rhythm with her fingers, waiting for the desired response: "Fuck yes!" Only for her soft thrusts to turn into more needy and rough ones.

Her fingers slides in and out of you; Introducing them deeper and deeper into the lubricious well of your walls, your thighs tremble while she fucks you with them. Unintentional sobs and moans that leave your throat uncontrolled and honestly, you wouldn't be able to describe it the feeling itself was so euphoric. She inserted another of her digits causing a squelch with each assault against your now sensitive pussy. "Please, Vika..." you whisper, the orgasm becoming more and more present.

As you remove her fingers from inside you, leaving your body shaking again. She brings her fingers to her mouth and licks them with an almost artistic discipline, but it is discouraging for her to want to taste you one more time, however, the throbbing of her point defeats that longing. "Would you like to eat my pussy, sweetness? Would you like me to cum all over your pretty face?"

“Yes, please,” you obey, she steps away from you and sits in her chair, the jingle of the belt buckle was your cue. You cautiously lowered her pants while she carefully watched your every movement. Sevika leaned her head against her headboard; you ran your tongue gently along the part of her pussy, she gently grabbed your hair to bring your head closer to her entrance. She set an almost obscene rhythm with her hips seeking more friction.

Sevika's fingers tangled in your hair pulling it lightly, she bit her lip as your tongue ventured even deeper into the confines of her clit. You lifted one of her legs up to your shoulder and left the other down.

She must have been fascinated by your skillful movement, she kept her eyes on you and you didn't break eye contact. Occasionally, involuntary grunts and moans escaped her lips, her swollen clit dictating that she was even closer to orgasm than before. "I'm going to cum all over your pretty face, sweetness."

Your face collided with her pussy again, her juices spread all over your face and she gave you a satisfied smile. Sevika got up from her seat, pulled up her pants and helped you up, she sat you on the table and cleaned the mess — which she made herself — from your face.

"Go home and clean yourself up, I'll come pick you up at eight."

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2024 © jnkangels | all rights reserved. do not copy, modify, or translate any of my works.

[teleportationmagic]

Inspired by the latest Batgirl issue

[jordiemeow]

bob's the kinda guy who'd prefer rubbing his tip on your clit while you both whimpered over actual sex ykwim

mmffhfhfhdgdghfah YEAHHHHH that

like he’s fully self-aware of the fact that as soon as he sinks into your tight cunt, he’s not going to last long, so he prolongs it as long as he can. but he could easily cum from just rutting against you.

he’s a gentleman—or, rather, a pleaser. he eats you out first so you’re real sensitive by the time he gets to it. taps his cock against your cunt a few times (he’s seen it in porn before), still half-dazed from experiencing you release all over his face. he’s barely coherent enough to get out a “your pussy is so pretty, babe.” and then an even more dazed “god, you’re just so pretty.”

and then he’s gliding his hard cock through your folds, eyes rolling back at the way he’s immediately coated in your arousal. the slick glide of him against you and the fact you’re already overstimulated from being eaten out has you whimpering. of course, it’s not louder than him. “o-oh, yeah! yeah, that’s it, holy shit. you feel so good.” he’s already keening shamelessly, one hand wrapped around his base to help rub his tip against your sensitive clit, the other on your hip to steady himself.

“m’doing good? yeah? you like that?” he pants out, as if he’s not literally just grinding his dick against you like a teenager. it’s a good thing you’re both enjoying this, courtesy of his foresight to go down on you first.

“so good,” you confirm breathily, back arching up off the mattress. he’s a sucker for praise, so that just spurs him on, pre-cum smeared all over your pretty pussy.

… and yeah, okay, sometimes he accidentally cums from just that. he tries to last, he really does, but sometimes he just—

“oh! oh my— hnngghh— wait, ‘m gonna cum, please, don’t—“ he whines pathetically as if he isn’t the one rubbing against you. a few more jerks of his hips and he’s cumming all over your stomach, crying out apologies the entire time. “oh, feels good, m’so sorry, ah—“

it takes a good five minutes of you petting his hair and promising you’re not mad for him to get his bearings and offer feebly, “i can go down again on you again, if you want.”

and, like the well-mannered young man he is, he cleans up his mess first.

[chaoticwriting]

YOU ARE MARRIED!!??3

Part 2

It's been a week since Ellie arrived at the manor. All the guests from the night of Ellie's arrival had already returned by that night. And so far, they haven't managed to pry open any more information about their brother-in-law from Ellie that they already didn't know of.

Currently, Ellie is sitting in the living room drawing on her green notebook while eating fruit snacks that Alfred prepares. Cass is watching over her, occasionally asking her what she is drawing.

Except for Cass and Alfred, everyone else is either at work or at school. Suddenly, a portal opens and comes out Cujo with a bag that has Ellie's name on it. So far, Cujo has been delivering Ellie's essential almost everyday for the past week. Whenever Ellie or Cass ask him about Danny, Cujo just shakes his head meaning either he doesn't know or he can't tell them.

Cujo also never stays for long and just jumps away whenever his delivery is done. But to their surprise, Cujo is not alone today. A woman in punk clothing and blue flaming hair follows after Cujo holding a guitar in her hand. Ellie perks up when she sees Ember coming out of the portal.

Ellie: Aunt Ember!

Ember: Hey Ellie. How are you doing? I assume you have been eating well.

Ellie: Yes! Everyone is so nice. Alfred always brings me snacks if I want to and grandpa Bruce buys me a lot of things.

Ember: Good good. I'm just here to say hi and check up on you. Your papa has been worrying a lot since he sent you here.

Ellie: Aunt Ember, when will papa finish his job? I miss him.

Ember: I don't know but for now you stay with your mama, okay? I will tell your papa to deal with his job quicker.

Ellie: Okay. :(

Ember then turns towards Cass and smiles at her.

Ember: Hey Cass. I'm Ember. Danny's friend. Sorry about the late greetings.

Cass: It's fine. About Danny, can I know what his job actually is?

Ember: Errmm, it's not that I don't want to tell. It's just I feel like you should ask him directly since even I don't know what his actual job is. Usually, Clockwork just calls him and off him go to wherever or whenever he sends him.

Cass: I see. But can I know if he is okay?

Ember: As far as I can tell, he is fine. Clockwork hasn't asked any of us for back up yet, so his mission is probably going well.

Suddenly, Bruce enters the living room seeing Ember and Cass talking.

Bruce: Why hello there miss. How can I help you?

Ember: *Stares*

Bruce: Errmm, miss?

Ember: You are that guy that got sent back and forth in time wasn't it? I remember your face from one of Danny's missions.

Bruce: What?

Ember: Yeah. You are Bruce Wayne, right? The Batman.

Bruce: How do you know about me?

Ember: It's not hard when your bestfriend is the one that helps one of his favorite heroes to escape forced time travel.

Bruce: Danny helps me back then?

Ember: Yeah. But at that time, he was mostly chasing after Plasmius. It is a coincidence he met you so he sent you back home first before he continued chasing Plasmius.

Cass: This Plasmius guy, how dangerous is he?

Ember: Ehh, depends on his sanity to be honest. One day, he might come to just fight you, another day he might try to release an interdimensional tyrant from his long slumber. So it's really random.

Cass: And this time?

Ember: Oh did Ellie tell you they are chasing Plasmius? I don't actually know what he is planning this time. Clockwork is being his cryptid ass again and not telling the whole story.

Bruce: Is this Clockwork safe?

Ember: Well, he is okay. I think he adopted Danny at one point so you could call him his adopted parents. But Danny also has real parents so there is that. Overall, he wouldn't allow any significant harm to fall onto Danny or anyone close to him unless he knows that is the best solution possible.

Ember: Oh well, I need to go now. Have a concert to attend to. Bye Ellie.

Ellie: Bye Aunt Ember! Bye Cujo!

Cujo gives out a bark and opens a portal. Both of them enter the portal and disappear from the living room. Bruce has that serious calculating look on his face while Cass just takes everything and processes them. She trusts his husband's judgement. And since she is with Cujo and Danny trusts Cujo, that means whoever Ember is, she is probably a friend.

Bruce goes to his study to enter the Batcave, while Cass and Ellie continue playing in the living room.

-Somewhere else-

A young man with white hair and black and white hazmat suit is flying across an urban city as he chases after a vampire-like older man that is holding a bracelet giving off a green light.

Danny: Give me the bracelet, Plasmius!

Plasmius: You gotta take it from my own hand, little badger!

Danny shoots an ecto beam towards Plasmius as he dodges the attack coming from Danny. Danny being agitated, tries to fly faster but he is already going as fast as he can.

'I wish I could just appear in front of him.'

Suddenly, Danny's vision goes black and when his vision comes again, he sees Plasmius rushing to him. Plasmius is shocked to see Danny suddenly in front of him and tries to maneuver away from him, but at such close distance, there is no way for him to outrun Danny.

Catching his wrist, Danny puts a collar that Clockwork specifically made for Plasmius. Plasmius turns back into a human and if not for Danny holding his wrist, would have fallen down from the sky.

Danny, seeing Plasmius unconscious, processes what just happened. Did he just teleport? How? He doesn't even know how to open a portal. He kind of just wishes it and it happened.

A green portal appears in front of him, cutting off his thoughts. Danny sighs as he doesn't even know what is going on. He should probably return first and ask Clockwork what is happening.

Part 4

[xx-knife-xx]

I don't know who needs to hear this, but reminder that Jason is in the same age group as Tim, Steph, and Cass. If you REALLY want to say he's not you have to say Cass isn't either because Cass is probably older than him. And is called "around Jason's age" a lot, regardless of if she's older.

Cass's 18th birthday happens in Batgirl 2000 #37, which was published in February 2003. (With a cover date of April 2003.) We know it's her 18th because in the 1st issue of Batgirl 2000 Babs calls her 17. Jason's happens in Detective Comics #790, which was published in January 2004. (With a cover date of March 2004). We know it's his 18th because Bruce outright says, "he would have been 18 today." After having already said, "Happy birthday, kid." to Jason's grave.

I know comic ages and timelines aren't always linear, but I think Jason's 18th birthday being published after Cass's is a good enough reason to think Cass is older.