Disclaimer: The Harry Potter book saga belongs to J K Rowling. This is a fan work done for entertainment purposes only.
The Harry Hermione Saga
Author note: Each chapter constitutes a separate, short story (unless the title says Part 2 or so), all under the overarching theme of "Harry and Hermione end up together".
Granger Twins, Version 1
"Good night, girls," said Monica Granger, kissing her two daughters on top of their heads while giving them a little hug.
Hermione, along with her sister Harriet, muttered a "Good night, Mum" into the hug, then tiptoed up to kiss their mum's cheeks and saw her out. They then disrobed down to knickers and socks, put on random flannel nightshirts and sat down in front of their mirror to take turns brushing each others hair, pinning it up and stuffing it inside their also randomly selected nightcaps. They then carefully inspected each other, to make sure that not a single strand of Hermione's big hair or Harriet's ironed-down, waist-length hair came out of their nightcaps.
And just as they were okaying each other, a knock came from the door.
Like clockwork.
"Come in Daddy," they chorused.
And so, Wendell Granger came into the room, tried to tell them apart (which he just couldn't do unless he could see their heads), then tucked them both into their bed, turned on the reading lamp on their headboard, and turned off the light fixture on his way out.
And so, the girls waited until they heard him entering the master bedroom, then they carefully climbed out of bed, reached under it and pulled out their "box of secrets": a common cardboard box they found in the street, painted with muggle repelling and notice-me-not runes (painted with their own blood).
Opening it, they found the weapons that they had been oh-so-carefully been making over the last few years to stop the coming war: evil-sucking jars. Almost a decade after the war, Hermione had found about these Aztec devices that simply sucked evil spirits right out the air; she later brought her findings to Harry, wondering if Quirrel could have had an "accident". They then spent five years looking for a ritual which could send them to their younger selves, and finally Hermione sabotaged Harry's ritual in the only way she found would make sure he wouldn't need to suffer a decade of neglect. Hermione knew too that her sabotage incurred the risk that Harry and she could have ended conjoined, or even as alternate personalities, but she was certain that even if those possibilities had happened, she would still have absolutely no regrets…
And so, Harriet had finished tonight's prayer session while she was thinking, Hermione helped her to fill the box again, then they slipped back into their bed.
And as Hermione picked up a high school chemistry textbook for some light reading, Harry curled up against her side and was out like a light.
Hermione tried to concentrate on her book, but didn't feel that much motivation tonight, and was rather distracted by the oh-so-cute noise of her sis snores against her right shoulder.
Eventually, she gave up, put her book on her bedside table and reached up to turn off the reading light. And she then gently shock Harry half awake, so they could both hug properly and fall asleep cheek-to-cheek.
And Hermione fell asleep, feeling no regrets whatsoever...
Prompt: Time travel gone wrong, then Granger twins.