Disclaimer: It's JKR's not mine, and I imagine the paces I am about to put some of her characters through would put her into shock.
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Insanity was too kind of a word to describe the actions Harry Potter and his wife had undertaken during the period now described as the Voldemort conflict amongst wizarding historians. Granted in a way insanity was perhaps the only apt way to describe his actions, given that he had been completely sane during the entirety of the time.
One supposed it all started when Ron had abandoned them after they had their little fight about the Horcruxes. Of course, he would always stain Ron with the brushstroke of that particular memory, not because of the pain it caused him, but for the pain it caused Hermione. She had been completely devastated and Harry assumed it had been because they were deeply in love. Doing the only thing he could think to do, he had offered her a shoulder to cry on, and due to some strange twist of fate a shoulder she slept on as well.
What had started as a simple act of comfort finally gave him the impetus needed to fulfill his destiny. He and Hermione had to very strong emotions coursing through their veins during those dark days, rage at the way fate had dealt them their cruddy hand and the overwhelming new love they had begun to forge between them. Most nights they had frantic sex until they simply fell asleep due to exhaustion, but there were also nights when they spoke quietly to each other about their next moves in the war, or what they would do with their lives after it was all over.
Their actions started simply enough, Hermione had finally managed to track the one who had been leading them by their noses around the countryside via the doe patronus. Of course, when they discovered a pale and startled Severus Snape, well things had gotten a bit out of hand. Magic no longer had those silly connotations of light and dark, instead it was simply a matter of what worked and what didn't.
Hermione used benign cooling charms to numb the man's body as they slowly destroyed him with a variety of everyday household spells. Harry couldn't help but remember his incoherent shrieks about his undying love for his long dead mother. Hermione had stopped that man's ranting by using a spell that would normally chop vegetables up, to chop something else up.
He would have never guessed that his lover, the girl he had always remembered as being a stickler for rules being so adept at torture. On the other hand it did make a perverse amount of sense that the daughter of dentists would know a thing or two about the application of pain.
In the end it had taken Snape telling them about the locations and identities of the rest of the Horcruxes for Harry to finally take part in the proceedings. Having found a book on dark rituals in a muggle bookstore of all places he had found out all about the ritual used to create Horcruxes and the specificities that could be used therein. It had taken but one properly places severing charm to end the run of the half blood prince and extract the piece of Voldemort's soul from his scar and place it into the locket.
Two days later they had both awoken when the wards of their little camp were breeched, only to find Gryffindor's sword setting just outside of the boundary and some large footsteps next to them. Hermione had taken one look at the prints before she concluded that Ron had tried to return to their midst only to be rebuffed by the wards. She had taken the sword with the assumption that is was to be used on any horcrux that they found the remainder of their journey having been imbued with the power of basilisk venom when Harry had used it in the chamber of secrets.
Another unusual side effect of their rage was that the horcrux and its effects had almost seemed to shy away from them now. It had only become more pronounced when Harry had rejoined the piece of Voldemort's soul in his scar to the one in the locket. With a simple stab of the sword two more pieces of Tom Riddle's soul took residence in hell where they belonged.
With that accomplished they next approached the goblins about obtaining Ravenclaw's diadem from the Lestrange's vault. Initially, the goblins had refused but after some well placed threats the object had been quickly removed and the horcrux dispatched off before it was returned to its original place. An unexpected bonus of the trip had been when the goblin's offered him the vaults of any executed deatheaters under the tenets of spoils of war.
After being told as much, the next trip was to Malfoy manor as they hitched a ride with Dobby to his former master's home. It hadn't been a smooth trip at all, but thanks to Beedle the Bard Hermione had already postulated that Draco Malfoy was the master of the elder wand. A trip during the night had revealed the wand in Dumbledore's tomb, and while they both had some mixed feelings about their actions they had taken it and planned on using it as the ultimate weapon to defeat Voldemort.
They had quite literally found the elder Malfoy's with their pants down, and after a quick pair of blasting hexes they had been dealt with. Perhaps even more disturbing was what they found Draco Malfoy doing. He was in the process of raping an unconscious Luna Lovegood in the cellar of the house as Old Mr. Ollivander was screaming obscenities at the boy.
Harry proceeded to cast a body bind on the monster before he began to work off six years of anger and frustration on the twit. Hermione meanwhile removed all traces of Draco's actions before she revived the girl and freed here along with the elderly wand maker.
Harry had just finished scooping out Draco's other eye with a conjured spoon when a scream from a familiar voice froze his blood. After administering mercy in his own way, and ending the Malfoy line forever Harry turned and was face to face with Bellatrix as she held a barely conscious Hermione at wand point.
Harry glanced around for Luna and Mr. Ollivander and assumed they had gotten away when he couldn't spot them. The first spell he had actually cast on another human being with the elder wand was not one he'd soon forget. It was a highly concentrated piercing hex and instead of acting almost like the magical equivalent of a knife, the enhanced spell pierced and then continued to completely destroy the crazed woman's right knee, in essence removing her right leg beneath the knee in the process.
Bellatrix crumbled all too quickly at this point, and Hermione stumbled away her eyes still glossy with lingering pain. Harry waved a general healing spell in her direction and she immediately started to look better. A moment later Harry cast the cruciatus on Bellatrix Lestrange for the second time in less that two years. Where the first time had failed because he hadn't hated the woman enough to properly fuel the curse, he had no such issues this time as he held the curse and watched Bellatrix thrash about on the floor as her blood quickly pooled under her from the gaping wound in her leg.
Slowly her struggles became sluggish and ceased altogether as she passed out from blood loss; her death wouldn't make so much as a blip on anyone's radar for hours. The remainder of the war seemed to pass in a blur from that point for Harry and Hermione. Potterwatch kept them abreast of Voldemort's puppet government, and the occasional letter traded with Remus or one of the Weasleys kept them aware of the Order's movements.
Voldemort himself had been rather anticlimactic after Neville of all people had dispatched of Nagini in the Battle of Hogwarts. Harry simply locked the brother wands up again, and then he pulled out the elder wand and cast the killing curse. Due to the nature of the golden cage that had formed, the death of Voldemort was only seen through Harry's eyes and due to the nature of Voldemort's magically built body, there was no proof left after the final sliver of soul remaining in the husk had been snuffed out.
Remus and Tonks had survived the battle, battered but still standing, and they had even announced that Tonks was nearly four months pregnant and that they had married. Ron and Ginny desperately looked like they wanted to separate Harry and Hermione, but what could they really do to the witch and wizard that had nearly single handedly won them the battle. While Harry had been engaged with Voldemort, Hermione had taken down Dolohov and had been engaged in a running battle with Fenrir Greyback that witnesses would long remember.
Rumors slowly leaked out in the days following Voldemort's final defeat of some of the things Harry and Hermione had been forced to do. In the end Kingsley Shacklebolt, the new minister of magic, had nominated the pair for an Order of Merlin. The surprisingly low number of casualties for the light side at the Battle of Hogwarts also meant that the festivities wouldn't be tainted by the somber mood of many memorials.
In the end Harry and Hermione decided that life in the spotlight was not something they wanted, and they brokered a deal with Kingsley that would make both of them representatives in the new Wizengamot in exchange for a large magically protected island off the coast of South America.
While it was widely known that Harry and Hermione Potter had been married, only two people received what amounted to a notice of non-invitation.
Ron and Ginny Weasley both got letters that simply said,
You both had our love and threw it away when you abandoned us. We are both happier than we ever were with you. So we only have two words to say to you now that we have married and are preparing to start the rest of our lives.
Thank you.
It took many years, but eventually wizarding Britain moved into the 20th and eventually the 21st century in regards to how they treated each other. But, the combination of Harry and Hermione Potter would always be remembered as the power that many did not know.