This is fanfiction land and I make the rules.
After Adrien awoke and subsequently succumbed to sleep, Marinette joined him in the land of dreams. She could not remember for the life of her what she had dreamt only the colours pink and peach.
By morning, the hospital's in-house neurologist came to assess Adrien. She had asked him several questions to determine what he remembered or not. She even questioned Gabriel, Nathalie and Marinette to double-check on any fact to see if there are further holes in his memory passed the five months.
There weren't.
She then checked his ability to make new memories. It wasn't affected either. He had no problems recalling from when he first woke up until now.
"He seems to have a form of transient amnesia due to trauma. He will regain his memories in due time. Nothing to worry about."
The intensity that had coiled its way in the room quickly vanished. He had amnesia but it wasn't irreversible. Fortunately, he would soon be back to his normal self. And maybe he would be able to shed light on what exactly happened to him.
"However, " she paused looking directly at Gabriel, "he would need someone to help him along the way. Help fill in the blanks-"
"Marinette. I want Marinette"
She blushed up to her roots. It was flattering that he wanted her for this task. Actually, it more than just flattered her it went straight to her heart like an arrow and her heart started to beat crazily like an animal fighting for his last breath. That was some graphic imagery, but it was explicit in what she truly felt. Her heart had no right to be beating as hard it does. He said he wanted her. It was an innocent statement and made sense in context next to the ongoing conversation, but that big part of her heart that still loved the model took it seriously out of context. Something she had no right doing because he had a loving girlfriend who wasn't answering her phone or called to check up on him.
"Adrien, wouldn't you rather Nino or Kagami?"
"No, I want Marinette. Only her. No one else."
Why must he say things like that made her feel so fuzzy all over?
"Son, please-"
"Father this is my choice and I have chosen that Marinette be the one to help me through this." He interrupted his father with a resolute voice that brokered no other deal.
She had never heard him so assertive before on anything, especially to his father. Usually he would cave with little fight. He had started to have more of a voice over the years, but when it came to his father he always deferred to his wishes or went behind his back. Something about him being so assertive did something her she hadn't felt possible.
"Sir, it would work out finely. You were going to move her into the Manor for her internship after going through her portfolio. You'll have to start it earlier but with a slight reworking of your schedule it may be possible"
"Merci, Nathalie"
Her hearts soared and plummeted in her chest.
"Je suis désolé but I can't accept this internship if you're only doing it for Adrien. I have no problem helping him until he gets his memory back; you don't need to give me the internship…" she trailed off.
"Nonsense. I had always planned to give you the internship, even without my son's prodding. I had only asked to see your portfolio as a formality seeing that I am already familiar with your work."
He jaw dropped. She already had the internship. So, she was working herself up for nothing yesterday pulling out all her works. However there was some good to it, if she had not been gathering her sketches she might have been at the Couffaine's helping Luka tune his guitars and not in her room when Adrien dropped in. but here was another thought: would Adrien have been attacked and lost his memories?
"I'll call her parents and notify them of the arrangements," Nathalie said walking out the room with her phone in her hand.
"If that's settled then we can have him discharged promptly. Follow me, Monsieur" the neurologist said guiding M. Agreste out of the room.
She was by his side once again when they were alone.
"I feel like shit" he groaned exaggeratedly
She giggled at him, "You slightly look like it"
Her little quip had him laughing with her. They continued to crack a few jokes before Adrien sobered up.
"Mari, what happened to me?"
She pressed her fingers to his lips.
"Not here. When we get home, I'll tell you everything"
She felt his lips move against her fingers. It was unmistakable, he had kissed her fingers. She gasped at the feeling. She instinctively brought her hand away, but Adrien stopped her with his own. His eyes had this intensity that she had never seen in his green depths before. Then he smirked, his Chat was showing through.
"I'll hold you to that. And I think id be deserving of a kiss later to.
He let go of her hand right as the nurses came to help him dress to leave. She couldn't help but cradle the hand to her chest. it tingled all the way to the Agreste Manor.
After situating Adrien in his room and showing her hers (right next to his) they were left alone. M. Agreste believed it would be best for them to have privacy.
She spent the next half hour going over the last 5 months. It wasn't too detailed. The neurologist had spoken to her before leaving and suggested that she slowly feed him his memories. Give him a summary of what happened during his lost time and whenever he started remembering something to help him through it. Then it finally came to the most important thing to tell him what she couldn't in the hospital. How he arrived in her room the evening before.
"Adrien, I know you're Chat Noir. You brought yourself to my room and de-transformed in front of me."
His face was impassive at her confession. She couldn't tell what he felt at all. Would he push her away or deny what she saw? He did give away his secret identity after all, albeit in a state of near unconsciousness. She would feel terrible if she had accidentally revealed herself as Ladybug to anyone, though it might not be as bad if it were to him, especially now knowing that he was her long-time partner.
They continued to sit in his grandiose bed in silence. She kept searching for a reaction from him. He slowly unfurled his arms, beckoning her with a nod of his head. She timidly crawled into his lap and embraced him tightly. He leaned down and kissed her on her exposed shoulder where her sweater had slightly slipped. Shivers were sent up and down from the simple contact.
"If there was anyone that would know my secret, I'm glad it's you." He whispered into her ear.
Word to the wise, this depiction of transient Amnesia isn't exactly how it works, I tweaked it so it fits my story.
Decided to add in my before chapter notes