Hyperdimension Neptunia belongs to Compile Heart, Idea Factory, Sega and whomever else worked on it.

Blame DeraldSny and his awesome "Misadventures of Hyperdimension Peashy" for inspiring this super-short one-shot.

Vert looked at the little girl with black hair and a black dress. On the girl's back was something that looked kind of like a backpack. "Hello?" The girl had pointed ears and red eyes and looked absolutely adorable.

"Ah!" The girl's eyes widened and she looked around. "Desco was looking for big sis!"

"Big sis?" Vert asked, trying to hold back her typical reaction whenever someone said that phrase around her. "Where is your big sister?"

The girl pouted and looked down. "Desco thinks that big sis died. Desco thought she died too, but Desco woke up here."

Seeing the girl looking absolutely miserable and sad, Vert had a determined look on her face, grabbed the girl and pulled the little one against her chest. "Shhh... It's okay. You don't need to cry. I'm sorry that your big sister died."

The girl sniffled and buried her face against Vert's chest. "Big sis wanted to take over the world too! And Desco is supposed to be a weapon to help her do that! And Desco... Desco wants to be the final boss!"

Vert blinked a few times. 'Hmm, her sister sounds like a rotten person, but final boss? Hmm...' Patting the girl on the back and trying to ignore how the tentacles felt that ran over her hands, Vert smiled softly. "You know... I know a couple of former final bosses." The girl stiffened and looked at Vert, who smiled at her. "My friends and I have all fought against them too."

"...Are you a Hero? That means you're Desco's enemy!" Desco looked at Vert in confusion.

"I'm no Hero. I'm a Goddess." Vert stood up. "But you know, if you want to be a Final Boss, you need to know how to handle main characters, don't you?" Desco nodded and Vert smiled at her. "Since your big sister isn't here... Would you like to be my little sister?"

"...Will you help Desco become a Final Boss?" Desco asked, hope in her voice.

"At the very least," Vert smiled at her, "I'll help you learn how to deal with main characters."

"YAY!" Desco threw her arms and legs into the air and leaned back and Vert could see a tail coming out of her back. "Thank you, big sister!"

The next thing she knew, Vert was smothering her into her large breasts, crying in happiness.

When Nepgear found Desco and started to gush over the little girl and stole her away to the lab, Vert finally understood how Neptune felt every time she tried to steal Nepgear away from the Planeptune CPU.

The army of Mecha Descos was a little concerning, however.

But that's a story for another time.

Desco is from Disgaea 4. She was created as a weapon to help Fuuka take over the world and her greatest desire is to become a Final Boss.

Mecha Desco is a creation by Mao in Disgaea 3 (PSVita version). They're mass-produced units that are among the best monsters in the game.