Rare to have a Fem!Katsuki, but rare to have a tsundere-yandere? Enjoy!

Katsuki took this opportunity to surprise Izuku with a wet willy. The blonde yelled "Panko!" as she inserted both of her saliva-laced fingers into both of his ears. Izuku yelped at the contact. Izuku felled forward as he hurt his head on the kotatsu. Katsuki fell back on Izuku's bed as she was grinning at Izuku's expensive.

"Told you the sea was coming close by," she cried at him.

Izuku was rubbing the sores on his head. "Ouch, Kacchan! Why are you so rough?"

She grinned. "Wanted to see how thick your head actually was." She dusted off her skirt and sat next to him. "So, have you decided on what costume you are going to wear?"

Their classmate, Kyoka Jiro, was hosting a Halloween party this weekend. The entire 1-A and 1-B class were invited. And the only reason why the entire class was invited was that Katsuki made a public tirade of the consequences of throwing the party while her parents were out-of-town. Izuku wasn't except. As she campaigned in the cafeteria, Izuku played the role of being her down. Equipped with a diamond-studded collar, leash, and all.

Embarrassing to the emerald cinnamon roll as he was always associated with the atypical, tyrannical Kacchan.

Katsuki threw a magazine at him. "Turn on this page. I think that should be our costume."

Izuku saw the magazine in question. The costumes were based off of the video game, NieR: Automata. Izuku was aware of the game as he played it a few times at Katsuki's house. Since the game's inception, she couldn't stop talking about the game.

"As you may know, baka! I will be 2B and you will be 9S!" She confirmed while crossing her arms. "That's the plan. No 'and's' or 'but's' about it."

"Why do you always pick costumes," he groaned. "You picked last year and the year before that."

Picking at her ear. "So, what's the point, you dog?"

"Nothing," he groaned. "Aside from being a bossy bitch," he mumbled under his breath.

"What was that, dog?" Katsuki kept her eyes shut as she smiled. Her fists were wrapped. "What was that again?"

Nervously, he replied. "Nothing! Nothing!"

"Good," she said.

Katsuki hit him anyway. "Ouch!"

As Izuku was rubbing his aching shoulder, his mother called him to the living room. Katsuki commented that Deku was probably going for his flea treatment. As he stepped outside, Katsuki took his pillow and began to inhale it. Oh, my precious, stupid Icchan! Sorry for hitting you! How should I know that you have terrible reflexes? She took another whiff of her pillow. God, I love this so much. You make my womanhood tremble when I make fun of you. I can't help it. That is how I show my love, you baka!

Ever since childhood, Katsuki had always given Izuku a hard time. Even since they were children in the sandbox, she tried discouraging him from doing things in every way possible. Always follow the leader was her code of ethics, even if it was an insecurity to keep him in her life. She had a crush on him and the fear of his possibility of becoming independent or obtaining goals scared her. She knew it was wrong, but felt it was the only way in keeping her Deku.

Izuku returned just in time as she tossed the pillow at him. "Ouch!" He stated to her.

"Poor reflexes, you baka dog," she grinned. "Might need to be put down or something." God, I love you so much. Can't wait to make you totally mine and become the father of our kits.

"Yeah, yeah," said Izuku. "Anyway, you got to go. Ochako is coming over."

Katsuki's face dropped. "Ochako? What for?"

"She's going to the party and Mom is helping her with her costume," replied Izuku.

Katsuki gripped her skirt. "You and her in the same place?"

"Umm, yeah. I said I would help, too. It looks sexy as well."

Katsuki grew frustrated but hid it behind her fake smile. "Did she say what she's gonna wear."

He shook his head in disagreement. "You know I won't tell you. Go against the rules of costuming."

"You're my dog, baka," she stated. "You must tell me!"

Izuku! Ochako's here.

"You heard my mom," he told her. "I will walk you to the door."

Katsuki kept her composure as she was led by Izuku to the front door. She met Ochako at the door as she carried her bag that contained her costume. "Hey, Kacchan. How are you?"

Katsuki put on a fake smile. "Peachy, real peachy." Why in the FUCK is this SHREW with my fucking man? That's my man, you whore! GET YOUR OWN GOD DAMN MAN!

"See you later, Kacchan," said Izuku as he closed the door without Katsuki saying goodbye.

Katsuki stood at the front door. As if a thundercloud formed above her head, her eyes became darker and darker. Oh, bitch! You stepped into the wrong territory. I've trained him to my liking and you just take him. It doesn't work like that. Please believe, bitch. I WILL MAKE YOU PAY! HE IS MINE!

BUT FIRST, A WAY TO GET DEKU ON MY SIDE...PERMANENTLY!

Halloween Night...Katsuki's house

It was a cool night as Izuku knocked on Katsuki's door. She made it urgent that he be there on time so they could go to Kyoka's party. The door opened and Kacchan's mother, Mitsuki showed up. She was wearing a sexy vampire costume, which contained all black short skirt with the corset. She gave Izuku the peace sign when seeing his costume. "My, my, sailor boy. A fine costume indeed," she grinned.

Izuku blushed. "Thanks, same to you. A vampire?"

"And a bitch," she grinned. "Kacchan told me that you were 9S from that video game she keeps bragging about."

"Yes, ma'am," he nervously said.

"Where's your blindfold?"

"In my pocket. Won't wear it til we get there."

"I hope you guys enjoy the party," said Mitsuki. She peered closer and whispered. "Sail into her harbor and your poop deck will be ravished!" She slapped his butt. "Have fun," she said. She yelled to Katsuki. "I am out, dear. Meeting your father at city hall for the party. Be home by midnight."

"Ok," she replied from the hallway.

She waved goodbye to Izuku as he entered the apartment. "Kacchan, I am here."

"Duh, stupid! Stay in the living room. I will be right out."

Izuku sat on the edge of the couch as he waited for her. He felt kind of ridiculous, especially with his hair. He couldn't find a wig so Ochako helped him spray dyed his hair gray. He often thinks how sweet Ochako is. She was nowhere near Katsuki.

"Here I come," she told him. Izuku was amazed when seeing Katsuki cosplaying as 2B. Her costume was tight in all of the right areas. Her wig was convincing and compelling. Her assets almost made him aroused...oddly. "Do I look good or do I look good?"

"You look well," he answered.

"Of course, you would answer, baka," she grimaced. "That's your job!" He thinks I look good. Oh, my God. Oh, my God. "You look okay."

"Thanks," he replied to the off-handed compliment. "Shall we get going?"

"Yeah, but first I need to go back to my room," she told him. "I got this killer black lipstick I am going to wear. We are going to be a hit at this party...me and my stunning looks. Be glad that you are not wearing the wig."

"Yeah, yeah," said Izuku. "Hurry up! I told Ochako we would meet her at the party."

Katsuki stood frozen. "Yeah." She changed the subject. "Why aren't you wearing your blindfold?"

"Didn't think I need to until we got there," said Izuku.

"Must we forget that you are a dog, baka. The master has you," she said. "Now, go to the bathroom and put it on."

He scoffed. "Fine."

Katsuki hit him.

"Ouch!"

"Don't know where this attitude comes from, but please correct it."

Bitch!

Katsuki hit him again.

"I know you, Deku! Your face called me a bitch. Now change."

Meanwhile in the bathroom….

Izuku went into the bathroom to put on his blindfold. He still wondered on why he doesn't have the courage to leave Katsuki. They were childhood friends but friends shouldn't be that cruel. He shook his head on his passiveness as he put on his blindfold.

He heard steps entering the bathroom.

"Hey, Kacchan. I am almost-"

Izuku felt someone putting a cloth around his nose and his mouth. He didn't have much time to react. He was gently carried to the ground before the cloth was removed.

Katsuki sighed heavily. "You're not going to Ochako. You won't be leaving me. I will make you want me. I will make you mine, forever."

Sometime later….

Izuku snapped his eyes open.

Upon his awakening, he, unfortunately, suffered a tremendous headache. As he was the anvil, the hammer throbbed on his head very profusely. It made him feel nauseated, regrettably wished that he was still asleep. He coaxed himself into opening his eyes again. He slowly lifted his eyelids, one at a time. Once they were open, his first thought was on his surroundings. He was on the floor. Strange for him to be sleeping there, he thought. The room was dark, only emitting a small faint of light from the outside. He couldn't see himself, but he had to know his whereabouts.

As he tried to move, he realized he couldn't. He turned to see that he was tied to the bed. Then, his eyes darted in front of him. It was sound of smacking noises.

He saw a white-haired girl bobbing up and down. He felt a tingling feeling. As he continued to decipher, he realized that it was his dick. And the white-girl was bobbing up and down was nothing more than Katsuki.

"Katsuki," he barked before feeling a surge of energy emitting out of him. He jerked as he ejaculated inside of Katsuki's mouth. Each time he spurted, Katsuki's ingest. Katsuki looked up, removing part of her blindfold, facing the stunned Izuku. "I will MAKE you feel my love."

To be continued….