Megatron is angry. His spark is hot with rage, and he cannot even begin to try to unravel it. His spark mate died in his arms and at the servos of a Prime. Megatron was angry at the system, angry at what it had put him and his spark mate through, but now. Now at had been the reason for their death.
Megatron is infuriated. He is grief-stricken and his spark aches with the loss. He doesn't feel whole, not anymore. The years you had spent together. Years he would hold close to his spark and cherish.
Megatron speaks to his closest officers, his helm in his servos. He cannot even begin to formulate a plan. His anger and grief ruling his words and actions. "Optimus Prime is our enemy. Anyone who allies themselves with a Prime is our adversary." His voice is rough as he speaks, and his subordinates can hear the sorrow.
His first mission is to take over the halls of Iacon and preserve your old study, the place where you had shared so many memories and so many beginnings. "We take Iacon." are the last words he utters before standing and leaving.
He had made the Pits of Kaon his. The place where he had met you, and spent some of your earliest moments together. The place where he began his journey to end the oppression of his fellow Cybertronians.
He had made the cells where he used to live a home. His own previous cell was a monument of sorts. His first real meeting with you. Little trinkets of yours on the old berth, a picture of you on the wall. A picture of you together. He wishes he could go back to those times, the time when you were both happy. His conjunx endura, his spark mate.
On Cybertron you the government doesn't fully recognize spark mates, but when you go through the steps of making them your conjunx it makes the two Cybertronians one. A singular unit in the eyes of the governing body.
Everything he had had been yours, and everything you had, had been his. But he had only ever wanted you. His servos itched to touch you again, even if just to hold your helm in them. To look into your optics once more.
When you had first met, first touched, first completed the bond, he wanted to live with you, but now. With you gone? He would have rather he died right there with you. That the shot had pierced the two of you at once. That he could have held you in death as he did in life.
He collapsed to his knees inside the small room, his servos twitching with the urge to hold you again. His servos reach for a small picture of the two of you that sat on the berth, he holds it with such reverence. He finally allows himself to cry, fluid dripping from his optics as he clutches it to his chassis.
His helm rests against the berth, every memory of you fills him with pain. His helm pounding. Megatron always thought he wouldn't be the type of mech to cry, but losing one's spark mate brings about a different kind of agony.
Megatron doesn't leave the room often, not for many months. Even when he does show himself there isn't much passion in his words now. Soundwave urged Megatron to show a strong front, but Megatron can't even think about how to fight his war. Not now, not with you gone.
His biggest supporter, his driving force, is gone. You both had such lives ahead of you, even with the war.
His grief had turned into rage, his desire to kill any opposition growing. With every step they took forward, it felt like the Autobots were right behind them, undoing all of his work. He wanted to make a home for his lost bonded. In your name, he would make this world a better place.
They had yet to take over Iacon, Optimus had a surprisingly strong front for the old capital. Megatron was angry that the last Prime would keep him from something so important. How could Optimus stop him from the last piece of his bonded?

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Will You Fall for Me Once More?
Fanfiction[TFP! Megatron x Reader] Megatronus finds his spark-mate in the most unlikely place, only to lose them. But he finds his spark mate again, on earth. He sees your face in passing, but even underneath your now human skin, which he originally found dis...