This is not a story about the superhero 'Black panther'. It's still about Loki, the title just fit :)
_

Natasha and me layed on the sofa watching tv while Loki was on the armchair next to us reading a book.
"I can't believe the others never watch documentaries with us", Nat said. "It's fascinating, and if we constantly save the planet, we might as well know a little bit about it."
"Right!", I responded as the zebra in the documentary got eaten by a lion. "Oh look! I love cats. Especially the big ones! I always wanted a cat, not to talk of petting a big cat."
Nat looked at me, then at Loki. "You say you want to pet a big cat?"
"Yes, it would be so great", I said. "Imagine how fluffy they are!"
Nat smirked, then she nodded in Loki's direction. "Hey you, shapeshifter, could you transform into a big cat? (Y/n) loves them, and because you like her, you could do that for her."
I threw a warning glance at Natasha. Since I opened up to her about my crush on Loki, she always acted like he liked me back. I mean, I definitly wasn't the bravest person on earth in regard of relationships, but were methods like that really necessary?
"No, Romanoff, I am not doing that. I am reading", he answered, not turning away from his book.
Nat sensed my disappointment right away. "Come on, you can read all day. Do (y/n) a little favour."
"Lions are very cool, by the way", I added shyly. "They look elegant and powerful and majestic ... and fluffy. And I could buy you some chocolate when we are going grocery shopping next week?"
Loki sighed and put his book away. He looked at me and my tummy tingled at the sight of his green eyes darting into mine. "Alright, but I am not going to be a lion." He stood up and walked towards me, and within two steps and a green shimmer he was a black panther.
"Wow!", I exclaimed and my glance wandered over him. "Panthers are much bigger than I thought."
The panther strolled to the sofa and sat down in front of it. Even in a sitting position, he was big. He was easily twice as heavy as me. I looked over him, his black fur shimmering in the daylight, covering everything down to his big paws and his lightly twitching tail tip. His green eyes were not less darting than in Loki's usual form.
"Well well, I am gonna leave you two alone", Nat said and got up.
"What? Hey!", I called indignantly.
"What, worried he is going to eat you?", Natasha laughed. "See you at dinner!" And with these words she was out the door.
I stared at the closed door and at the panther in front of me again. I never thought cats were able to have facial expressions, but I swear the panther looked amused, as if he was about to say 'Are you gonna pet me now or not?'
I smiled and hesitantly reached out to his head. The fur was softer than I expected, and I slowly ruffled it. Loki inclined his head so that I could reach the spot behind his ears.
"Oh, you like that!", I laughed while the panther was about to close his eyes.
The panther did a motion that could only be interpreted as a wink.
I blushed, then I reached further down to stroke his back. I started to become more confident while the panther leaned into my movements, visibly enjoying my fingers. He started to purr, a deep, velvety sound. I was really petting the god of mischief. My tummy tingle got worse.
I grabbed his paw and the panther flinched a little.
"Oh no, did I hurt you?", I asked startled.
The panther meowed what sounded like 'no'.
I laughed and took his paw what was as big as my hand. I touched the fur on top of it and the soft pad under it. I pressed lightly into the middle and sharp claws sprawled out, wrapping around my finger. "Wow", I said amazed. "These are long."
The panther looked proud.
"I think I really need to get a cat", I sighed and pet his head again.
With what seemed to resemble a smirk, the panther turned into a tiny black kitten.
"Oh my god", I whispered in a high pitched voice. "You are the cutest kitten I have ever seen!" I picked it up, what the kitten didn't seem to like, layed down on the sofa and placed it on my chest.
He left out a little "meow".
"Oh gods", I said and practically melted at the cuteness. It was so tiny, and fluffy, and green eyed and everything that I thought I was about to cry.
I cuddled the kitten and stroked its fur, soon it rolled on its back and without thinking I massaged its tummy. The kitten purred and stretched oneself, moving its little claws in and out.
"Aww", I said. Soon the kitten rolled on its tummy again and closed its eyes. I smiled happily and continued to stroke it. The purring slowly fade out and as it was gone, a green flash occured and suddenly a sleeping Loki layed on my chest, his weight pressing me into the sofa and his arms were wrapped around me tightly.
I practically turned into stone as the shock of his sudden closeness hit me right here and there. I looked around the room (as if anyone was there to see what was happening) and realised my arm was also around him. My fingers were in his raven hair.
I swallowed and felt his heart beat while his chest slowly rose and fell. I mean, I had forgotten that the kitten was really Loki, but that he was now laying on me in his normal form was something entirely different.
The smell of leather from his armour and some sort of mint perfume reached my nostrils. I closed my eyes and hugged him lightly, a smile spread over my face. I really, really liked him, and his presence was overly comforting.
My smile grew wider and I carefully touched his hair. It was soft in a different way. I admired his calm, resting face, no anger in it.
"You are beautiful", I whispered. "As a cat too, but I like you the most in human form."
"I am a god, not a human", Loki murmured.
I froze again.
He smirked and opened his eyes.
"But you were sleeping, right?", I asked.
"M-hm", he muttered and positioned his arms in a slightly more comfortable way. They were still wrapped around me. "Could you do the thing with my hair again?"
I couldn't believe my luck. I chuckled happily and went with my fingers through his hair. After a while, a streak fell down on his nose.
Loki sneezed.
"Oh, sorry", I laughed.
"No problem", he laughed lightly with me. "I should transform into a cat more often."