Frank had been carrying frisks body, and not to notice his aura, his appearance, his eyes. Had changed into...non-normal human. Which he didn't know and it is draining his energy and power, fast.
Franks feet were now begging for rest, until his right feet gave up and stumble on the floor. His aura was still there, but the glitching colors in his eyes slowly vanish. He's starting to get dizzy. And tired.
"Frisk...please, wake up..." he whispered. He sat down on the floor with Frisk still on his hands. He's running out of breath "toriel...."
"Here...contact me when you need help or..anything"
"That's, right...the phone she gave us" he said, he dug in his pocket and took his phone, dialing toriel.
It took just seconds before toriel picks up the phone "hello? This is toriel" hlshe said from the other side of the phone.
"Toriel....I need help" Frank replied tiredly "Frank?! Is this you? Why? What happen?!" Toriel said, now worried. Frank chuckled and turn to stare at his sisters unconscious face "Frisk...fell....unconscious......" he replied, Franks head was now spinning violently "o-oh okay! Stay where you are! I'll immediately come there!" She said when her voice got a little higher "where are you?!" She asked. Frank looks around, but clueless where they went. But, there was a flowers...red flowers all over the whole floor, almost covering it "I don't know but...there's flowers" he said "red flowers....a-around...toriel...I don't think I can stay up more..." Frank slowly and carefully place Frisk on the bed of red flowers "I'm gonna pass out any minute" he added, rushing off some ng air strands covering frisk's beautiful sleeping face "umm...flowers! Right?! I-I will arrive there---" she heard a soft thud from the flowers.
Frank had pass out, laying beside Frisk, his aura disappeared, the symbol on his skin slowly fades away "Frank?! Frank?!....goodness!--" after that, a beeping sound was heard.
While they are laying unconscious on the red flowers, a yellow flower pops out "I'll take this as my chance" he whispered evilly, when pallets surrounds them after the world turned black and white and both they're hearts was floating out just above they're heads "ha-ha-ha!....Die" he whispers at the last part. When the pallets strikes they're hearts. A barrier suddenly toss his evil pallets away. He was shock "what just....happened?" He gritted his teeth and tried one more time "again!" He shouted and surround another circle of pallets to they're heart. And this time, it wasn't just a barrier, when a slash of wind attack him from Franks heart "t-this is...the heart is attacking when...the owner is unconscious... I've never seen something like this before" he said to himself. Franks heart changed it's color into green and it glowed "what?..." flowey noticed some flower veins are growing beneath him, wrapping around his feet "what Is this!?" He exclaimed, trying to brake free from the strong grip.
Franks heart suddenly attacks pallets into a circle, which is one of flowers, attacks "n-no way..." he whispered in anger with fear "WHAT EXACTLY ARE YOU?!"he screamed, when the pallets we're about to hit him and finally kill him. A voice was heard which stoked the battle "Frank! Frisk!, where are you?!" Toriel was running from the distance while she us holding her phone. The heart turned red and retreats the flower veins, flowey stared at the heart when it whispered in it's head.
"Never...attack...the...high majesty...begun, or I'll be force to erase you"
It was a deep voice, yet strict. The voice sent chill down floweys spine "high...majesty?" He said when toriels footsteps was getting near, flowey stared at the heart one last time before sinking down. The world turned back to it's normal color and both the heart, disappear.
"Frank! Frisk! Fris--" her eyes widen to see two children laying unconscious on the bed of red flowers "--oh dear...goodness me, what happen?" She approached the two and carried Frisk head "wake up...my child, Frisk..wake up" she called softly, Frisk grunt in pain, unable to open her eyes "what happen...tell me, dear" she said.
"Frank..." Frisk called, toriel carefully placed her head on flowers and called Frank "Frank, dearie...tell me what happen" Franks eyes slowly opens, his vision was blurry bit knows it was toriel "toriel.....Frisk.....is...unconscious.....help...h-her" he said softly "so do you, dearie...cone here you two...I'll take you to my home" toriel said, carrying the two siblings.
(Toriels house)
Frisk woke up in a comfortable bed, she placed her hand to her forehead which her head is killing her "mnn...f-frank?" Groan, looking for her brother. She sit up and examine her surrounding, it was a child's room. Lots of toys and drawings around "Frank?..." she called again. When her door suddenly opens, revealing her brother "Frisk...your awake" he's face quickly lit up, to see his sister now awake. He quickly closed the door behind him and hugged her "finally...you woke up" he said, Frisk hugged him back "Frank..w-what happened to us?" She ask, Frank tighten his hug and buried his face deeper in her neck "Shh...it's okay, it's okay...were now safe...okay?" Frank comforted her. Which she nodded.
It took a while before the twins separated they're hug "you suddenly fell unconscious...I was so worried sick, Frisk" Frank scolded her. Which Frisk replied with a smile, scratching the back of her hair "sorry...but, what I said was true...brother" she said...
"You did...see--"
"--the future... yes, also with the past and thoughts" Frisk cut his sentence, she look down to her hands "whenever I touch a monster...they're past would play fast forward in my mind...it's so painful and scary....the thoughts of each monsters are filling my head with whispers...especially, whenever I see they're future...it's so blurry...so unclear...but I know....whenever I hear screams of fear. It scares me..brother...it scares me so much" Frisk started sobbing, placing both her hands on her face "I saw how they were killed...and got revive again...I saw how they suffer, brother...it's painful in my chest...it's so scary!" She yelled the last part.
Frank couldn't do anything but stay silent, hearing his sister sobbing. With fear and sadness, he felt a slight stingy feeling in his chest. He clench his fist of anger. While he hears her sobbing cry.
"Frisk.....when you...pass out. Something really weird happened to me...." Frank said "Frisk...this, never happened to us..." he whispered, leaning his head on frisk's shoulder "we must never, let anyone know about our identity...Frisk.. what ability we can do...what things we can do that just awoken...we must never let anyone know anything about us....do you understand?" Frank look up to her, cupped her cheeks looking at her straight "Frisk...promise me, whatever or what..is happening..right now...we will find out, soon..but right now...let's keep it a secret" Frisk nodded "pinky swear?" Frank ask, Frisk rubbed her face "pinky swear" she replied, with a smile.
They both placed they're foreheads to each other, taking this moment with just the two of them "I'll never let anything happen to you....ever" Frank whispered and kiss Frisk forehead.
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Your majesty?
Are you both.....
Awake?

YOU ARE READING
Other timelines (undertale)
FantasyFrisk has an older twin brother. After fighting with her mother, she ran away to Mt Ebott. Her brother Frank, followed her deep into the cave. After hearing a thunder, it startled both the twins. And fell into the hole of abyss. That is where they'r...