Eren's POV:
I hadn't thought much about where (F/n) said she was going, I just assumed she was going off to have some time to herself. After all, in a few days, we would be bonded together forever. She deserved time away from me.
Though, I had nothing to do myself. I had no orders from Erwin or any of the other scouts at the moment, so I was stuck with an empty cottage. It was nice though, empty and quiet. It gave me time to think about things..
A giant crash that shook the entire cottage snapped me awake from my day dreaming. I gripped the arm rests of the chair I was sitting in. 'What the hell?' I thought quickly running over to the window to see what the booming noise belonged to. It sounded pretty close, too.
My eyes widened as I caught sight of the noise maker. '(F/n)!?' her titan form took hold of my eyes, and I was unable to move them. The 13 metered wonder had a look of death, and began to walk.
'I've seen that look before. She has that look every time she kills titans, everytime she even mentions the damn things. This.. it can't be good.' I left my statued post at the window, and quickly grabbed my 3-D gear.
I don't even understand how she transformed.. I wasn't there, I didn't even touch her.
But that didn't matter now. All that mattered is figuring out what exactly made her transform, and where the hell she was going.
******
I swiftly attached to a building in front of me, my surroundings a massive blur. I had to catch up to her and somehow get her attention. She was fast though, no doubting that. I was having trouble keeping up.
Finally, I attached onto a building about thirty feet in front of me.
I had finally matched her position, and shifted the hooks on my gear to her shoulders. She was still sprinting, making it almost impossible to even gain a grip on her.
Seeing her up close in titan form.. was slightly unsettling. Her (e/c) held a promise, but also a direct path to darkness and clear terror. Even her teeth were gritted, sheilding the heavy puffs of breath coming from her mouth.
"(F/N)!!!" I screamed, attempting to get closer to her ear.
She continued running, signaling that she hadn't heard what I was saying.
I had to do something else, something that emotionally impacted her feelings for me.
..but what?
I had no idea what that could be... she already knows that I love her..
"(F/N)!! PLEASE, I NEED YOU TO LISTEN TO ME!!! IT'S EREN!" I yelled loudly, my voice slightly cracking.
I had no idea what had made her so angry, to transform into a titan right inside the walls. For her to forget about the people that she could hurt and the buildings she could damage, it had to be bad. Something that gave her sheer intentions.
"I'M OKAY, (F/N)!! PLEASE, I NEED YOU TO STOP, THIS ISN'T YOU!!"
I gripped onto the solid skin covering her neck, as her body crashed to a halt.
Her face softened, as she lowered her eyes down to me. She closed them, as she carefully kneeled down on the ground.
"Eren!!!" Hanji's voice echoed from a short distance. I turned around slightly. "Hanji?" I asked confused. I felt (F/n)'s body tense up, and her facial features began to harden again.
Hanji had angered her?
Hanji stopped a few feet away from (F/n), as she screeched signaling her not to comw any closer.
I lowered my eyebrows.
"Hanji, what the hell did you do?" I asked.
Hanji nervously laughed.
"Well uh, (F/n) came to me for help with her titan shifting,"
I cut her off by glaring at her.
"Hanji, we're titan shifters, not actual titans. You don't know what you're dealing with!" I angrily spat.
"No, no, no! See, I wanted to test her reactions to your well being, so I told her the military police was going to kill you, and she transformed before I could ev"
"Why...why the fuck would you even tell her that?! She's not in control, Hanji!! That's why she came to you!!" I cut her off, becoming more angry by the minute.
Hanji nervously grinned. "Eh heh heh... But it does make sense now, doesn't it? The first time she transformed, she was worried about your happiness... And now, she's worried because she thought.. well.." Hanji slowly began to stop speaking.
I shook my head, and noticed that (F/n) had already begun deteriorating.
It had only been in a few minutes when the head of her titan had completely evaporated, and (F/n)'s body had become visible.
I quickly ran over to help her, but she had already begun detaching herself from the dead titan flesh.
I opened my mouth to say something, but she spoke before me. "I'm fine, I promise. Just a little weak, thats all." she said, softly wrapping her arm around her abdomen.
"Here, let me." I said before getting consent from her, and picked her up carrying her bridal style in my arms.
Hanji approached us, with a frown on her face. "(F/n)... I'm.. I'm sorry.. my experiments got caught up in my head, and-"
(F/n) somberly smiled. "Its fine, Hanji. Your experiment worked. Now we actually know what causes me to transform."
Her smile suddenly faded into a frown when she noticed the damage left behind from her titan rampage.
"O-oh my god, I did that?" (F/n) said, concern and fear covering her voice.
She looked at me, as she began to tremble violently in my arms.
"Di..did I kill someone? No... I-I killed people!" She said as began rushing out of her eyes.
I held onto her tightly. "No, no, its fine. You didn't kill anyone." I said attempting to calm her down. To be honest, I don't know how many fatalities took place. But she didn't want to know, and I wasn't going to tell her. I wasn't going to torture her with the fact that she had no control over herself. I wasn't going to do to her, what most people had done to me.
She turned her head, and began sobbing into my chest.
"I-I'm so sorry!!"

Well well well. Look at you, you shameful reader killing peeps. *shakes head.*
Hahaha just kidding. Did you guys enjoy this chapter? I hope so because I enjoyed writing it! ^_^ Be sure to favorite, comment, and vote! The next chapter should be up pretty soon! Love you guys!!!- Drama Typhoon