This is for ChihiroFujisakiRP it's a little different then what you asked for but I hope you'll like it

It was down to three of them. Well, at least that's how it used to be. One of them had murdered Sayaka Maizono, even though they promised that the killing would stop. But one of them couldn't help themselves. It was down to Makoto Naegi and Junko Enoshima.

"Let's start with, like, the murder weapon," said Junko boredly.

"Why don't we just start voting?" suggested Makoto. "We're both gonna vote for each other." Junko shrugged.

"Alright," she said.

"Upupupupupu! I think I'll put in a vote of my own!" giggled Monokuma. A voting panel came up to his chair and he pressed a button on it. Junko voted for Makoto and Makoto voted for Junko. The voting machine came down and spun around. The panels spun around and landed on Mukuro's face.

"Ding ding ding!" laughed Monokuma.

"W-W-Wait," said Junko, her face turning purple. A cloud of smoke appeared around Monokuma and standing there after the smoke let up was...Junko? Makoto looked at the two, a questioning look on his face. Junko walked up to "Junko" and tugged on her hair. A wig came off, revealing short black hair.

"Hey sis," grinned Junko, blushing. "Oh the despair it gives me to execute my own sister!" She drooled.

"M-Mukuro Ikusaba!" exclaimed Makoto. The sixteenth student that Kyoko got killed because of!

"Hi Makoto," she said, blushing. Feeling self conscious, she crossed her arms across her chest.

"Why would you kill Sayaka??!" he exclaimed angrily. "We-We were- We were in love! She told me she loved me!"

"But I love you too..." she muttered quietly. "I've loved you since we were at Hope's Peak..."

"Wait...you guys were sisters?" Makoto asked. "Junko is the mastermind then...you helped take our memories! You helped lock us in here!" Mukuro looked nervous.

"But I had no choice! She was my sister, I-"

"Upupupupupupu!" laughed Junko, holding Monokuma in front of her face. Then, mushrooms popped out of her hair. "You don't want to experience the final despair of death? You don't want me to have the despair of losing my sister?" She then held up rock signs with her hands and stuck out her tongue. "That's not fucking fair sis!"

"I-I-I-I-I-I," stuttered Mukuro, looking between the two. Her lover and her sister. She was unsure who to choose.

"No Junko," she said quietly. "Of course I'm a little excited to experience the despair of death. Who isn't? But," she glanced over at Makoto, seeing him looking hopeful. "But that doesn't mean I don't have hopes of my own."

"My sister...chose Ultimate Hope...over me?" said Junko, speechless. Her face contorted into a painful expression, then a creepy smile. "This is so despair inducing! HAHAHAHAHAHAHAHAHAHAHA! UPUPUPUPUPUPUPU!" Her hair turned into a single ponytail and there were glasses on her face. "I'll give you two hopeful lovebirds a minute alone. I understand that you will be ready by then." She walked away.

"Makoto," cried Mukuro, realizing that she didn't want to die. The SHSL Lucky Student walked towards her and caressed her cheek.

"You chose hope," he smiled. A dark look came over his face as he said the next thing, "You did kill Sayaka. And-And imprison us here."

"B-But," stuttered Mukuro, completely losing her cool soldier composure.

"But you chose hope!" said Makoto loudly. "In the end, hope won you over. And-" he was interrupted by her kissing him. Makoto closed his eyes and kissed her back. They were interrupted by loud footsteps walking towards them. Mukuro jumped away, embarrassed. Her sister was wearing a crown. She climbed the podium and picked up a controller with a red button on it.

"Junko," said Mukuro, looking up at her. Junko smiled, the grin stretched across her whole face.

"Mukuro Ikusaba, the SHSL Soldier, has been found guilty," she said, her face turning red as she drooled. "Now to feel the despair of executing my sister!" Mukuro forgot all about her kiss with Makoto as her face took on the same look as Junko's. She would get to experience the wonderful final despair of death. Chains came around her neck and dragged her into the arena. The stage unfolded.

Mukuro Ikusaba has been found guilty! Now commencing execution.
Super High School Level Soldier's Punishment
Despair Is A Battlefield!

On the execution stage, Mukuro was standing there with a rifle. Talp buildings surrounded her. Monokumas started coming at her. Rapidly she blasted them apart, shooting bullet after bullet. There were too many of them. They kept closing in on her. Frantically she kept firing. A bullet made its way into her firing arm. She dropped her gun in surprise. A bullet hit her in the head and she fell backwards into the crowd. Monokumas kept firing until they walked away and all that was left was a pile of blood.