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For the Dogs

Summary:

It's perfectly normal for teenage boys to have sexual fantasies. When Tim's period keeps attracting Titus' attention, Damian is reminded Tim has a vagina, and looks for an opportunity to make his fantasies come true.

Notes:

This is a PWP and is designed to be kinky. There isn't much emotional depth to it, just a transgender boy getting fucked by his little brother and dog.

(See the end of the work for more notes.)

Work Text:

The Wayne Manor dining room was unusually quiet that evening. With Bruce already out on patrol and Alfred retired to his quarters, that left the two brothers, Damian and Tim, to fill the air with conversation. Neither were up to that. Tim sat at the long table, picking at his dinner, his discomfort evident as he kept shifting in his seat. Damian was also picking at his dinner in discomfort, though he doubted their reasons were the same.

Damian's class had covered the first part sex ed, filling him with visions of vaginas, labias, clitoris'... He never knew there were so many shapes and sizes, or how complicated they were. But now that he did, he understood why his father and brothers were so mad about them. They were fascinating to say the least. 

It had been hard to sit still in class (or all day), especially when Miss Summer's sweater shifted and Damian could see the shape of her breast underneath. Damian wondered if her breasts looked the same as the ones in the textbook when they weren't being covered. He imagined they would. His mind conjured the dream of her taking it off right there in class, gesturing for the boys to come touch her - explore her. Learn her body. 

Damian would marvel at her nipple hardening in the cold air, his spit sharpening the sensation. He wanted to feel the softness crushed between his teeth, his fingers moving into her--

"Titus, no!"

Titus, Damian's Great Dane, had padded around the table, sniffing curiously before stopping abruptly in front of Tim. Without warning, the dog rudely shoved his snout directly into Tim's crotch, inhaling deeply. 

Tim was pushing his nose away with an indignant, "Bad dog!" 

Damian tilted his head with interest. "He seems particularly drawn to you tonight, Drake. Did you forget to wash your underwear?"

"It's because I'm on my period, you little monster," Tim snapped, taking his plate to the sink. He deposited it without eating a single bite, then started making himself tea instead. 

Damian's eyes widened, his mind turning back to the class and the information on menstrual cycles. Specifically, he remembered them talking about how females had a heightened libido on their cycle, everything feeling better and orgasms helping with cramps. It was all very interesting, to say the least. 

He wondered if Tim had a heightened libido right then. Was he sitting there with a warm, wet groin - his nipples stiff and body in need of being filled? Was he thinking of dicks while making his tea?

Damian swallowed, a strange, nervous feeling making his stomach bubble. He stood up and peered around the doorway separating the two rooms. 

Tim had all the equipment of the females in Damian's book, but he was such a guy, Damian wondered if Tim's mixed biology responded to stimulation like a man, or a woman? Kyle said girls could have back-to-back orgasms, coming three times before a boy even had one. Was that something Tim's body did, or was he more of a one and done like natural boys? 

Would Tim spurt white goo from his vagina when he finished? Would it happen every time? Could Damian just spend hours making Tim squirt over and over again, each one as intense and messy as the last? It was an intoxicating fantasy.

Titus made another attempt to get at Tim's crotch, this time more determined. When he did, Tim's sweats pressed down into him, teasing at his hidden form. Damian lingered on the way Titus' nose made it obvious where the entrance to Tim's body was. And though he'd seen the older teen almost fully naked a million times before, it seemed different then in that moment.

Once Damian noticed that, he also noticed the way Tim's chest sat a little perkier that day. His chest was still natural, held down by skin tape and binders when on patrol, but loose when at home. They were petite, not like Miss Summer. Damian wasn't picky, though. He'd take the whole thing in his mouth if it was small enough. Maybe bruise them a little, get them glossy and plump.

These thoughts were a plague, distracting him, making him feel things he didn't want to feel. Yet, he began watching Tim with a new intensity, cataloging every detail: the way Tim's hips were subtly curvy, the softness of his jawline, the way his ass curved...

Maybe if Tim didn't hate him he could ask to see, or touch, as a scientific curiosity. Tim encouraged those. Or maybe, his mind whispered, he'd strip right there in the kitchen, climb up on the table and spread his legs, letting Damian feel around, rub his clit, lick him...

Or maybe something would happen on patrol so Damian didn't have to ask. Tim could be trying to fit through a damaged wall and get stuck, and Damian could come up and undress him while he was blind to what was being done, and by whom. Maybe when Damian was done, he'd just leave Tim naked, maybe subtly send some thugs his way and watch from afar as they queued up and filled him so full, he dripped.

Damian cleared his throat, disturbed by how tantalizing that thought was.

It wouldn't work anyway. If Tim were blind, he could still probably tell Damian apart by touch. 

Or would he?

That was something to think about. What parts of Damian did Tim know well enough to identify?

He was leaning over the counter, scrolling on his phone, his eyes crinkling as he smiled. Anyone could drive his head into the counter and fuck him from behind, hiding their identity with simple maneuvers. The only thing he'd know, if done correctly, was the size and shape of the penis.

Damian needed to stop thinking about it. It wasn't healthy. Surely not. 

He walked back to the table and ate his food in silence, thinking about it anyway. 

There were options. Overload Tim's system with pleasure or pain, keep him light headed so he couldn't think or process information. Or make Tim so happy, he develops Stockholm Syndrome and just falls in love. 

Damian was handsome. He looked like his father did at the same age. He'd seen the pictures. And it's not like Tim was that much older. A romance between them was entirely possible from every angle. 

It seemed more fun to try and make it secret, though. He felt a thrill thinking about what he'd do if he, or anyone, wanted to take Tim and keep him from finding out their identity as they did. They'd need materials, of course, and the perfect moment when no one would interrupt for however long they wanted. 

Sometime like that night.

Anyone who would intrude on them and stop it was out, and Tim seemed particularly vulnerable, potentially horny. It wouldn't take very much at all.

Not much at all...

Damian waited a few hours to make sure Alfred was well and truly asleep and collected his tools of choice, including a towel for the mess, an electric toothbrush, and duct tape. He'd use Tim's own shirt as a blindfold, holding Tim's head into the mattress until he was ready to tie it on him.

He found Tim in bed still in his sweats and under shirt, drifting off to sleep over his homework, his backpack on the floor. The door creaked when Damian opened it slowly, but Tim didn't rise. After a moment, the soft snoring made Damian feel confident enough to creep in, getting the tape ready.

The moonlight illuminated the soft curve of Tim's cheeks as Damian approached, making him look both younger and more effeminate. Or maybe that was Damian's imagination. He wasn't going to think too hard about it until Tim was secured. He needed to focus and get Tim's shirt off sooner rather than later.

When Damian touched Tim's arm, gripping it at the wrist, Tim's eyes shot open. "Damian? What are you doing in my room?"

Mission abort.

Damian had no good answer. He was going to just silently back away and stick to his fantasies only. Then Tim eyed the duct tape and immediately ripped his arm away, sending a kick towards Damian.

Everything happened too fast after that. Tim fought with skill, and maybe a touch of unresolved anger issues over their last fight. But Damian's training gave him the advantage. He saw the opening before Tim could close it, and within minutes, Tim was pinned face down on his bed, his arms twisted behind his back as Damian efficiently wrapped duct tape around his wrists and down his hands, turning them into one solid ball of gray.

He needed to tie up Tim's legs. So without ceremony, he yanked Tim's sweats down, revealing his intentions along with Tim's purple boxer-briefs.

"What the hell?"

Tim tried to kick again, but Damian dodged, and then sat down on Tim's back, out of reach. He pulled the sweats down the rest of Tim's leg. Or, at least it was enough he could secure Tim's smooth calves to his plentiful thighs, wrapping the tape over them several times, until Tim was stuck kneeling for the foreseeable future. With that done, Tim was finally immobilized and in a vulnerable position.

"Damian, stop!" Tim struggled against the restraints as Damian climbed down. He had a moment where he knew he could walk away and this would be chocked up to being a mean prank. Just boys being boys. "You little pervert!"

The problem with that is that Tim's resistance was actually more exciting. Damian would figure out what to do about it later. Maybe blackmail or something. But in the meantime, he grabbed Tim by the legs and dragged him down the bed to the footboard. Just like he imagined when he came up with this plan, he taped each leg to one of the posts of the bed at the knee, spreading Tim wide, leaving both holes completely within Damian's control, and mercy.

"I'm conducting an experiment," Damian replied calmly, producing a small knife from his pocket. He cut away Tim's underwear, his breath catching when he saw the layers of folds. It was like a little maze.

There was some blood around Tim's entrance but that wasn't much of a deterrent, especially not when he saw the older boy's clitoris was swollen and long. He wanted to touch it and see how close to a penis it was, impatient now that the hour at hand was upon him.

"Damian!" Tim's voice was high with surprise. Damian liked that. He liked it a lot. "This isn't funny!"

In Tim's backpack, Damian located a small box of binder clips and rubber bands, his imagination going wild as he thought of so many things to do. He went to work clipping them strategically along Tim's outer labia, then looped the rubber bands through the hoops at the end. He stretched each one until Tim gasped, then looped the end of the rubber bands around Tim's big toes, keeping them spread. The way his body just opened for Damian looked like a lovely flower blossoming. 

Tim whimpered when Damian was able to get two binder clips on his clit, then pressed the electric toothbrush against them. He watched the way Tim's body jumped under the vibrations, the clips barely moving. When he moved the toothbrush onto the little stub of Tim's clit that wasn't being squeezed, Tim's muscles clenched up.

Damian held it there, watching Tim's body start to squirm until he suddenly stilled, a groan marking the orgasm. Damian pressed a finger into Tim's hole and found it wet, a little bit of blood coming out with the juices. 

"Remarkable," Damian murmured. He left the toothbrush there as Tim tried to jerk away, seemingly not understanding the position he was in. "Quick reaction."

Damian moved around to Tim's top half. The look of pure hate in Tim's eyes only made it easier to grab him by the hair and force his head and shoulders back. With one hand, he carefully cut out circles on Tim's shirt right where his breasts were and then reached in and rolled Tim's nipples, fighting back the urge to yank.

The didn't mean he wasn't going to use the binder clips there as well. They made Tim's nipples get angry and red, just before dropping Tim, the clips catching on the duvet.

"You son of a bitch!"

There were so many ideas coming to him, Damian didn't know where to start. He decided he needed to find more things to experiment with, still a little too intimidated to take Tim personally. Though, he wasn't sure he was going to wait for that too much longer. 

He tested Tim's bindings and then went on a hunt for phallic-shaped objects. He only chanced a few minutes, finding very little until he spotted Titus's squeaky rubber toy with its distinctive nubs. It was shaped almost like a bone, with the two ends being wider than the middle. Damian had a feeling the little nubs would do something wonderful inside of Tim, though, and hurriedly brought it back.

When he got back to the door, he noticed it was ajar. Titus had followed the alluring scent of Tim's blood into the room and was pressing his nose in greedily, Tim trying to shoo him away. Damian smiled and stood back, waiting to see what would happen.

The Great Dane began to lick enthusiastically, making Tim yelp out in surprise before renewing efforts to escape. His desperation to get away was doing something magical to Damian's belly, making him tingle from the inside out. As Titus' large flat tongue lapped at Tim's sensitive parts, slobbering over Tim's clit, it was turning the skin red. And when the tongue slipped inside, Damian had to sit down, completely mesmerized, wondering what it must feel like for Tim.

There was a lovely warmth spreading through his body, his own arousal awakening as Tim's muscles locked again. Damian watched, fascinated, as Tim's mouth opened, his face contorting, but no sound escaped. Better, Damian lifted Tim's shirt and looked at Tim's stomach and breasts, which had turned red, his arousal burning a blush all the way down from head to toe. His nipples, though, were dark. Damian flicked the clip and Tim whined in response.

"No, no, no," Tim chanted, breathless. As Titus continued his enthusiastic exploration, Tim's pleas changed. "Please, Damian, make him stop. Please, I'm begging you!"

Damian didn't respond, his attention fixed on the scene before him. He noticed Titus' penis emerging from its sheath, red and hard, and long. For a moment, Damian seemed uncertain what to do, but then Titus climbed up Tim, hooking his paws around Tim's hips, positioning himself to mount the boy. 

"Damian, stop him! Please!" Tim begged, his voice breaking with terror.

Titus' paws scratched Tim's back getting into position, each one digging into his kidneys as the dog shifted to find its purchase. Damian sat back and freed himself from his pants. He absently touched, just following the good feeling, wanting to see the whole show before he finished.

"Please, God, Damian, don't do this," Tim's voice was a broken whisper, his forehead mashed into the duvet. "Don't... please."

Damian's voice dropped to a conspiratorial murmur as he grabbed Tim's hair, pulling him back far enough he could watch the fatty tissue of his teacup breasts jiggle. "But Titus... smells what you are, Drake. A bitch in heat."

The dog's hips thrust forward, and the pointed tip of his cock breached Tim's body, causing the teenager to scream. It wasn't like a finger; it was much bigger, forcing its way in with brutal, uncoordinated persistence. As the dog's length drove deeper, Tim started trying to slam his head against the bed, unable to escape the agony and humiliation as the rough texture of the canine shaft scraped his insides raw.

"Look at you," Damian's voice was just salt in the wound. "Taking it so well. Your body knows its purpose, doesn't it? All that studying, all that pretending to be a man... and here you are, pinned to your bed, being bred by a dog. This is your true nature, Drake. A warm hole for the dogs."

Tears streamed freely from Tim's eyes, soaking the fabric beneath his cheek. Titus was a monster, punishing Tim even before the knot began to swell at the base of his cock. Damian stared at the thick, hard bulb that battered against Tim's entrance with every inward thrust, threatening to lock them together.

"I'm going to fucking kill you," Tim sobbed, his voice cracking. "Fuck you!"

Damian moved down Tim's back, leaning over to watch the penetration happen up close. Taking some drool from Titus' maw, he rubbed the toy down, then pressed it at Tim's other hole.

"Stop!"

"Stop?" Damian's fingers found Tim's clit again, rubbing it in tight, cruel circles. "Why would I stop when you're enjoying it so much? Your body is clenching around him, Drake. You're trying to milk him, trying to pull that knot inside. Don't lie to me. Don't lie to yourself."

A particularly violent thrust forced the swelling knot past Tim's abused rim. The pop was audible, a sickening sound followed by Tim's body convulsing, them locked together for the next few moments. Damian chose that moment to shove the toy down with his full force.

The sound that escaped Tim was a shriek of pure hate and violation. Tim's back arched even beneath Damian's weight. Damian pumped it twice, until Tim's shriek became a strangled cry, his muscles again locking up, an orgasm ripping through him. As he came, a fresh gush of menstrual blood poured from him, coating the sheets beneath and smearing across Titus's pumping shaft.

"There it is," Damian breathed, his voice thick with satisfaction. He watched as Titus's body went rigid, the dog letting out a low growl as he began to pump his seed deep inside Tim. It seemed to go on forever, filling Tim until it, too, gushed from his stuffed hole.

The sight of Tim's blood and the dog's semen mixing as it dripped from his body seemed to drive Titus into a frenzy. The dog's thrusts became more erratic, more forceful, as he instinctively drove his knot deeper, ensuring his seed would take. Tim's body rocked with the force of it, small moans escaping, his voice no longer strong enough for anything more.

Damian's own hand was moving on his cock, his strokes quick and efficient. "Look at that," he murmured, his gaze fixed on where Tim's body was joined with the dog's. "Tied together like the bitch you are. Beautiful." 

Fourteen long minutes after, the only sounds were Titus's panting and Tim's ragged, hitching sobs. The knot held fast, a brutal anchor of flesh and fluid. Damian had to stop touching himself, letting the feelings cool down before starting again. He spent that time playing with Tim's breasts and clit, making him cum again. 

Now Damian laid back on Tim's pillows, stroking himself again, looking into Tim's tear stained face and wondering if Tim would bite if he shoved his dick into his mouth. When it finally began to subside, Titus pulled back a torrent of fluid following - a mixture of blood, semen, and Tim's own juices sliding down his thighs.

Tim was shaking as Damian stood up, stretched, and, without a word, pulled the clips off Tim's oversensitive clit. They only stretched it at first, until it slid off, dragging the tight metal down the length of him. Tim's body leapt off the bed before he collapsed back down, still not able to scream.

As it turned out, it was easier to drag Tim over the edge, and his climaxes seemed to get more intense faster. It also left Tim's body in a state that seemed demanding of more. Like the more he came, the easier it was to come, the more he wanted to come, even if his mouth begged for it to stop. 

On impulse, Damian slapped Tim's vagina and watched the older boy jump, knowing every touch probably felt sharp. He did it again until Tim was twitching.

Damian removed the toy, needing to see it in the place he originally intended, especially since Tim was so tender. He marveled at the blood on there, and how it didn't look much different than the blood from his womb, then pressed it into Tim's puffy little cunt. It slid in easy, the sound of it so pleasantly moist.

The older boy jerked. "You're sick," Tim spat, his voice raw. "You're a sick bastard!"

Damian's expression hardened as he ripped off another piece of duct tape. "Be quiet." He firmly taped Tim's mouth, silencing his rude little mouth. 

The toy was most definitely one for his cunt, with Damian twisting it and randomly pumping it, each tiny little nub making Tim spasm. The sight of Tim, bound and bleeding and stuffed with a dog's toy, was a potent aphrodisiac. He dragged his hand up his own cock, his thumb smearing the fluid leaking from the tip over the sensitive head. A low hiss escaped his lips. The feeling was electric, a sharp, focused pleasure that made his hips twitch.

He began to pump in earnest, his movements fluid and practiced. His eyes were locked on the sight of the rubber toy wedged in Tim, the way his swollen, abused entrance fluttered around it with every pained breath he took.

Damian had every intention of just getting himself to where he could fill Tim's other hole, which had been stretched so beautifully. But as he thought about reaching around Tim's body and grabbing the clips attached to his nipples, yanking them hard, Damian accidentally came. The orgasm was a blinding wave of ecstasy. His cock pulsed in his hand, thick ropes of cum shooting out to splatter across Tim's back and the ruined sheets. The pleasure was so intense, it left him gasping and trembling in its wake.

His knees felt weak, his body buzzing with the lingering aftershocks. He milked himself dry, his fingers coated in his seed.

As Damian looked at the clock and calculated how many hours he had left before Bruce returned, he wondered just how long it would take before reality forced the fantasy to end. How long until he needed some kind of story to explain this that didn't damn him as a pervert or get him kicked off the team.

Six hours didn't seem like a long enough time.

Damian got the electric toothbrush and started moving it across the rubber bands, his brain turning as Tim cried.

Notes:

Thank you for reading!

This was last revised: 9/29/26

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