This is kind of how I see Akari's sister...
Very short; rated T just to be safe.
Akari x Akane
Ultimate Siscon
"Why won't you show Akari your room?" Teary-eyed, the redhead asked her big sister a question that had been on her mind for far too long. Taken aback, the oldest redhead fumbled with her words. She hadn't prepared herself in case Akari asked her 'that' question; she actually assumed her sister would accept her words as usual.
"Well... it's messy..." After saying this, Akane facepalmed internally. She had been the perfect siscon stalker for nearly a year, and that's the best she could come up with?
"I don't really care about that, my room is messy as well!" Akari's reply was cheerful to say the least, her mind set in convincing her sister into letting her see the room. Kyoko's and Yui's insistence in not seeing it only served to fuel her curiosity.
"It's really, really messy." It couldn't be helped. Her lie, as pathetic as it was, had to be reinforced. She definitely couldn't let Akari see her precious altar.
"Mine is really, really messy too." Akari pressed. Akane sweatdropped.
Then, an idea popped in her mind.
"What if we have a sleepover in Akari-chan's room tonight?" She clasped her hands together and gave her sister her warmest smile, hoping to distract her sister.
"Really?!" Akari started jumping around the living room, excited about the proposal. It had been so long since they had slept together. Around the time her sister wouldn't let her come in her room anymore, actually. But Akari, being the air-head she sometimes was, didn't pay it much mind.
"I'm so happy!" Akari proceeded to shower her big sister in hugs and kisses before dashing up to her room to prepare it for the night to come.
Akari was unaware of the mess she had left behind, though. Her sister sat on the couch, her mind still trying to catch up with the recent events.
"Eh?" Akari did not know that she had woken the beast within Akane. The ultimate siscon side she had been struggling to hide for so many years was slowly but surely resurfacing, minute by minute.
"A...kari..." Akane managed to refrain from moaning the name.
"Eh? Did you call?" Akari's small, innocent voice asked from the stairs. She was smiling brightly at her bug sister, completely oblivious to the predator's intentions.
"No..." Akane said as she regained her composure and smiled at her little crush warmly. "Is your room ready?" If only Akari wasn't so innocent, Akane couldn't help but think. Then again, that's her biggest appeal, right after her cuteness.
"Yep." Akari fidgeted as she smiled and blushed. "Onee-chan..." Akane merely smiled at her and hummed, already thinking about how many fantasies she would get out of having a sleepover with Akari.
"Onee-chan!" Akari yelled, pouting cutely at her sister who was anywhere but there.
"Yes, Akari?" Akane asked sweetly.
"I was wondering if... Akari and Nee-chan could sleep on the same bed tonight?" Akari blushed cutely, feeling very much like a little girl again. It had been such a long time since her sister and her slept together on the same bed she barely remembered what it felt like.
Akane, on the other hand, was having a mini seizure in her mind.
Akari and I on the same bed... alone...
Akari and I...
Akari...
Together... alone...
Akane's smile would have frozen Hell over.
"Lead the way, little sister!" Akane cheered on. Akari clapped her hands giddily and skipped all the way to her room.
"Lead the way..." Akane mumbled as she followed after her prey. For one small moment, she pictured them as Red Riding Hood and the Big Bad Wolf.
"Onee-chan, hurry!" Akari called from her room. "The bed is warm and comfy!" Akane's creepy smile only widened as she rubbed her hands together.
"Red would definitely look well on Akari..." She pondered an idea for a moment. "But I definitely prefer my Akari bare."
Then she skipped happily towards her little sister's room, more than eager for the night to come.