Fionna looked up from the black sword she was examining in the armory when a tall man entered. Her eyes widened for a second and then looked back down, her cheeks blazing red. This man was the epitome of an adventurer. He had huge shoulders, a sculpted torso and long legs for agility. He even had a mechanical arm, for Grod's sake!

"Oh, I'm sorry, I thought it was empty in here." Good gravy, even his voice was perfect. She looked up and smiled weakly.

"Uh, nope…I guess it's not." She didn't like him or anything. He just was so beautiful to look at. She stopped shortly when she reached his face. It looked so familiar…

He seemed to have felt the same thing. "Do I, um, know you or something, ma'am?" His blue eyes reflected her confusion. She stood slowly and stepped close to him. He instinctively stepped back as well, but froze when Fionna reached a hand up to his white bear hat…

"What are you…" he knelt, so she could reach better. She, slowly so very slowly, pulled a lock of honey gold hair out. He seemed to notice her hair for the first time as well.

Finn felt a cry coming out from deep inside when he looked close at this small woman's face. Worried something would crack inside if he didn't know, if he wasn't sure, the truth this very minute, he pulled her golden hair away from her neck and saw pale creamy skin.

"Good Grob above, what is this?" he hoarsely whispered. Fionna had a hand to her move and was barely holding her tears back. "Who are you?"

"Fionna? Fionna, where are you?" Marshall Lee's voice seemed to shake her enough to call out to him. When the vampire entered, he saw Finn kneeling next to Fionna, holding her hand.

Shit.

"Marshall, what is this? Who is he?"

Finn looked up with Fionna and Marshall shuddered at their similarities. Fionna stood, still holding Finn's hand. "Who is HE?" her angry scream brought Marceline, Gumball, Cake and Bubblegum around the corner.

Marceline flinched back into Gumball. Bubblegum didn't know what was up, but she felt the need to explain to this hysteric young woman.

"His name is Finn. Finn the Human." She didn't know why the girl looked as if Grob had appeared out of the sky to grant her every wish and as if the Lich came as well, to take her soul.

"Bubblegum, do you know her?" her husband looked as if he was about to cry. It broke her heart.

"No, I don't. Marceline?" The Vampire Queen sobbed.

"Finn…This is Fionna….the human…"

Marshall pulled Fionna close to his chest. "She's your twin sister."

"My what?"

"His what?"

Marshall and Marceline shared a glance before trying to sort out this new drama in their eternal lives. "We thought it would be best for you guys if you were separated when we found you, you know what I'm talking about Finn. Remember how Mr. and Mrs. Rainicorn almost ate you?"

"Wait, you almost got eaten by a what?" Fionna looked perplexed. "I've heard of Monocromicorns, but not Rainicorns."

Marceline waved a hand. "They're similar to Rainicorns, but different. But the point is we wanted to protect you from monsters. We knew you'd be in more danger together than apart. I mean, your parents-"

"You knew our parents?" Finn looked murderous by this point and had a hand on the hilt of his sword. Bonnibel ran over to him and held his hand.

"Please continue, Marceline."

Marceline sighed. "We never knew your parents, but…

"It was around 19 years ago when I got a call from Marshall. He sounded really upset; he said that he found something."

Marshall cleared his throat. "I had been walking through some woods and I heard fighting. There were Why-Wolves, definitely, and it sounded like they were fighting just some normal people of Aaa. That's what I thought at least…" he took a shaky breath, "When I came into the clearing, the Why-Wolves had already left. There were two…bodies there still. I got closer, I realized that they were human." The vampire turned to Finn. "Your father was already gone when I found them…but your mother…"

Marshall turned away from the grotesque remains of the human man, bile rising in his throat. There was little left that could be defined as an actual creature, but he still covered the corpse with branches and leaves, while murmuring words of rest and farewell.

He moved as if to leave but a small moan stopped him. There, mostly hidden in the bushes, was another human, clutching two small bundles of cloth. Marshall choked and stepped forward. Nearing, he could see that it was a woman, with short brown hair. Her eyes were squeezed together tightly, all tears dried on her cheeks. Her torso, legs and neck were shredded into wicked ribbons. It was a miracle she could utter any noise at all.

"Please… Pl-please help…" the words grated against her throat. Marshall Lee knelt next to her, propping her head carefully onto his lap.

"It's all right, ma'am. I can help, I'm here. I can help." He choked again, tears threatening to overflow his eyes. The woman opened her eyes slowly and held her bundles tightly.

"My children…Please, take my children somewhere safe…" Her crystalline blue eyes bore into him. He nodded wordlessly, leaning over to pick them up carefully. As he looked over the two small faces, her head lolled to the side as she sighed.

"Wait, wait! What are their names? What's going on? Don't die!" He became panicked, trying to hold her children and keep her hanging on. She smiled up sadly, her breath coming slower and slower.

"Fionna and Finn."

And with that, Rachel Darrowby, one of the last humans, died.

Fionna just stared at him, tears streaming down her cheeks, completely silent. Finn was silent as well, but his cheeks were dry. Bubblegum and Bonnibel both stared at Marshall, their mouths an open "o".

Closing his eyes, Marshall turned to Fionna. "Please, Fionna, I am so sorry. There aren't words to describe how sorry I am. We honestly had no idea that you two would ever meet and we thought it would be safer-" SMACK

Marshall looked up from where he had fallen, his cheek smarting. Fionna stood before him, her chest heaving.

"SAFER? You thought I would safer? Safer not knowing that I had a BROTHER? That I wasn't ALONE? How DARE you think that! HOW DARE YOU! You assumed I would be HAPPY like that? You- You- AUGH!" With that she turned and fled up the stairs to her room, her sobs echoing through the castle.

Marceline sighed and leaned against the wall. "Well that was just peachy."