...Is sometimes filled with dogs

After telling their mum that they wanted to be in the future, she instantly turned serious before putting a serious face on, one that sent shivers down the duos spines and from there she started their training to make them the best heroes that they can be.

Since that day the sisters have been putting lots of effort into training both their bodies and their quirks as their parents told them that if they didn't train both then they couldn't make the most out of their quirks.

For their quirk training Momo made lots of Russian matryoshka dolls as they had a complex yet simple design, allowing her to learn to imagine the structure of objects better and use the lipids within her body more efficiently.

Luna however instead of just sleeping started to research different types of cats and their different kinds of behaviour, so that she could be more cat-like when she was a cat. In doing so she reignited her passion for cats and is now somewhat lively when awake, but she still sleeps like a cat, almost wherever and whenever possible.

One day Luna is researching one of her favourite felines, the cave lion. An extinct subspecies of lion that existed over twelve thousand years ago, it is also one of the largest subspecies of lion with one of its many prey including cave bears and prehistoric mammals.

As she is busy learning about these felines, watching videos on their supposed behaviour and reading papers on other kinds of information, the marks on her head begin to glow and as Luna is busy reading about one of her favourite species she doesn't notice.

After a while the glowing stops and soon after Luna gets up to go to the training room within the house, so that she can attempt to move more like a cat. She gets there and sees Momo covered in sweat still working out with Kumi watching over her like a hawk, she shivers a little at the site remembering her day of training with her mum.

Luna walks to an open area in the room with most of her thoughts being about cave lions before she stops and gets ready to mimic some of their behaviour so that she can become a more aggressive cat just like cave lions were before they went extinct.

She leans over ready to transform and instead of it being quick like usual after her years of practice, this transformation is slower. Her eyes glow brightly for a brief period which catches the attention of her mother as she turns and watches her daughter struggle to turn into a cat, which confuses her as she knows how much time she spent trying to make it as quick as possible, so she walks towards her and Momo walks beside her.

They near Luna as she begins to change and instead of getting smaller she grows slightly, she becomes longer, her arms and legs morph and become more muscular as her hands and feet change into large paws, her face become longer and her ears move towards the side of her head and round off slightly, large pointy teeth grow inside her mouth and tawny coloured fur sprouts all over her body with it being slightly longer around her neck and at the end of her now longer, thicker tail. She was now just over six feet long from her head to the tip of her tail and a little over three and a half feet in height, which was over five times larger than her regular cat form, her most comfortable feline form. The crown marks once again move and begin to sprout at the top of her head and form a slightly bigger tiara that would fit better in this new form

Luna's cave lion form.

She finishes transforming into what looked to be a lion to the spectators, unbeknownst to them though this was still a somewhat small version of the cave lion as Luna was still just a child and therefore her transformations could still grow, the same as her. She stretches like she would normally before releasing a deep and majestic

"ROOOOAR!!"

which stuns the two listeners as it reverberates throughout the room, also startling Luna slightly as she was just trying to meow like she normally would. She finally looks around properly and realises that she is taller than she normally is which horrifies her as she wouldn't be able to sleep on Momo's lap at this size.

Luna looks down to see two giant paws which remind her of her most recent research subject, the cave lion. As she wonders what is going on and why she looks like one of her favourite felines her sister and mother walk closer to her as she begins to transform back.

"Hey sis what was that?"

Momo questions her little sister with a dumbfounded look on her face.

"I don't really know either, I was just going to try and copy a cave lion to see if I can improve my cat form and I guess I somehow turned into one?"

Luna says more energetically than usual as she finishes transforming, but instead of going back to having silver hair, the colour of her heir remains tawny and her ears remain slightly rounded but return to the top of her head whilst her tail is still longer and bushy at the end.

Unknown to either of the three however Luna's change in temperament to become more confrontational, energetic and upfront was due to her currently retaining the features of one very aggressive, extinct subspecies of lion.

"hehe I guess my little kitty can become a big kitty now in which case you better start researching more felines then so you can make the most of your quirk Luna."

Kumi says towards her daughter who started noticing the differences between her regular cat and her cave lion human forms.

"Yes mum!"

Luna says excitedly as she begins to train, now in human form with her further increased physical capabilities due to her now being part cave lion.

She was excited for the future, but now with this new information she knew she had a long way to go before she becomes the best cat.