
Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/13906887.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      F/M
  Fandom:
      Batman_-_Fandom, DC_-_Fandom
  Relationship:
      Batman/Batgirl, Bruce_Wayne/Cassandra_Cain
  Character:
      Bruce_Wayne, Cassandra_Cain, David_Cain, Jason_Todd, Barbara_Gordon
  Additional Tags:
      bimbofication, bimbo, Bimbo_Fetish, Sex_Slave, willing_sex_slave, Weird
      Romance, Twisted, Mentally_unstable_characters, Kissing, Groping, ass
      grabbing, ass_pinching, Older_Man/Younger_Woman, Age_Difference, Underage
      -_Freeform, Sort_of_dubious_consent, big_age_gap, No_Sex, Love, Dark,
      Kind_of_Snuff_but_not_really, Mindbroken, mind_wipe, Drugs, Consensual
      Brainwashing, kind_of_incest, Adopted_Daughter_Sex, Father-Adopted
      Daughter_Sex, Father-Daughter_Sex, Submissive_Batgirl, Submissive_Female
      Characters, dominant_Batman
  Series:
      Part 9 of DC_Fetish, Part 6 of Batman_Fetish
  Stats:
      Published: 2018-03-08 Words: 1127
****** Sink Into You ******
by StannisTheMannis
Summary
     Cassandra Cain.
     Raised to kill.
     Murdered a man at eight years old.
     Trained all her life by an abusive father to be the world’s deadliest
     assassin.
     Is it any wonder she’d rather forget who she was? Is it any wonder
     she’d want to erase the life she once had, to become something else
     entirely?
     Is it any wonder she’d decide to dedicate her life to pleasing the
     one man who treated her right?
Notes
See the end of the work for notes
“Are you absolutely sure you want to do this?”
The vigilante known as Batman stood in the cavernous center of the Batcave, his
cowl pulled down to reveal the handsome features of Bruce Wayne, contorted with
worry and conflict.
In front of his stood Cassandra Cain, known to the public as the Batgirl. The
teen hero was fully undressed, and Bruce’s eyes roamed over her lithe body,
taking in her long muscular legs, her tight little ass, her breasts barely
bigger than a prepubescent boy’s, with tiny brown nipples hard in the cold cave
air.
Cassandra looked up at Bruce with an expression of pure docility, dark eyes
wide with girlish innocence, black hair flowing freely down to her shoulders.
And as he stared down at her, it occurred to Bruce that she was the most
beautiful thing he’d ever seen.
That’s why he felt so torn about what he was about to do to her. But at the
same time, that’s why he knew that he had to do it. That he had no choice.
“I’m sure,” replied Cassandra. “I want this. I need this.”
Bruce nodded slowly. There was no use arguing, not when both of them wanted it
so badly. When he spoke next, the gentle, caring tone he had been using slipped
away, replaced by the voice that gave the criminals of Gotham nightmares. The
voice Bruce used to intimidate. To control.
“Turn around,” he ordered, and the girl did as he said without hesitation.
The older man ran one strong hand down her soft, smooth back, stopping at the
curve of her buttocks, giving it a little pinch that made Cassandra yelp, then
giggle.
“This is going to sting,” warmed Bruce, taking the large syringe from a counter
at his side. It was filled with a clear pink liquid, tipped with a long thin
needle.
Slowly, carefully, he pushed the needle into the flesh of her lower ass.
Cassandra whimpered, whether in pain or pleasure Bruce could not tell. When the
syringe was fully in, Bruce pressed down on the plunger, squirting the pink
liquid deep into her veins.
The girl closed her eyes, mouth open, letting out little gasps and sighs as the
concoction flowed through her blood.
When Bruce was done, he pulled the syringe out of her, placing it back on the
counter. Seized by a sudden impulse, he wrapped his arms around Cassandra, one
holding her stomach, the other wrapped around her neck. His cock, hard from the
contact, pressed against her backside.
“How do you feel?” Bruce whispered in her ear, and Cassandra shivered, eyes
still closed.
“I feel... good. R-really good.”
Bruce smiled proudly. It had been no easy task developing the formula,
combining Pamela Isley’s pheromones with Jarvis Tetch’s brainwashing technology
and even a touch of Joker Venom. The process had taken both money and patience.
Luckily, Bruce had both.
And it was clear now that it had been worth it.
“The mental changes will come first,” explained Bruce, as Cassandra trembled in
his arms. “You’ll find it hard to think. Even the most basic thoughts will be
stressful, as your brain becomes more and more fuzzy. Once the chemicals take
full affect, there will be no going back. No returning to the way you were. If
you have doubts, any doubts at all- tell me now, while you still can. We can
still reverse the process-“
Cassandra shook her head almost violently.
“No! No... it feels so good. So... amazing. Don’t stop it. Please, don’t stop
it!”
Bruce could tell she was close to crying, so he spoke soothingly, trying to
calm her down.
“I won’t. Not if you don’t want me to. Just remember... the process won’t stop
with your mind. Your body too will be transformed. The person you once were
will be gone.”
And when she heard that, Cassandra smiled.
“Good. Good.”
Pity filled Bruce’s heart, replacing the arousal that had been building.
Cassandra Cain, raised from birth to be a living weapon, made into a murderer
at the age of eight, raised by a father taught her nothing but violence and
death-
No wonder she wanted to forget. No wonder she wanted to lose herself to the
drug’s haze.
No wonder she didn’t want to be herself anymore.
Cassandra’s legs were wobbling, her whole body growing limp. Bruce held her up,
arms tight around her, and he planted a series of kisses on the back of her
neck, on her cheek, on her collarbone. She groaned, her voice growing weaker
and weaker, and moments before sleep took her, she mumbled something so quietly
Bruce had to lean in to hear it.
“Th-Thank... Thank you...”
Then she was unconscious, and Bruce hefted her up into the air in a bridal
carry, carrying over to the Batcave’s medical table, gently lowering her down
onto it.
The girl’s body was limp on the flat metal surface, her arms and legs sprawled
out at strange angles like a rag doll. Cassandra’s eyes were rolled back in her
head, showing the whites of her eyes, and her mouth hung open, a thin trickle
of drool dripping down her chin.
Helpless. Powerless. Lifeless.
Bruce leaned down, slowly bending until his face was inches from hers. Their
lips brushed together, and Bruce thought back to the stories his mother would
read him when he was a baby.
Snow White.
Sleeping Beauty.
But in reverse, the kiss not awakening the princess, instead drawing her deeper
into her sleep. And Bruce was no handsome prince, rescuing the damsel in
distress.
He was the dragon who captured them in the first place.
And with a kiss, I die
Bruce watched as the seventeen year old girl slept in front of him, the
chemicals inside her working hard to erase her mind and contort her body,
turning her from a serious and silent soldier in the fight for justice into a
brainless bimbo, a stupid slut with no thoughts besides how best to please her
master, enlarging her breasts and her ass and her lips, making her his slave-
And in that moment, Bruce knew what love was.
Love was about protection. Love was about keeping each other safe.
He had loved Barbara, and he had loved Jason. He had loved his parents. But he
couldn’t keep them safe. He couldn’t keep any of them safe.
But now it would be different. Bruce would be able to keep Cassandra safe. She
would be his property, and she would be protected. She would be loved.
And in return, Cassandra would keep Bruce safe. From the demons locked away
deep within him. From the ghosts that haunted him whenever his eyes were
closed.
Because she loved him. And that was all that mattered.
End Notes
     This was originally going to have multiple chapters, but I’ve decided
     I’m happy with it as it is. If people want me to continue, I will.
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