When Harry and Hermione have a creature inheritance, both of the same creature non the less, Harry's seems to be that of a baby, so Hermione and her newly formed instincts take him in as her 'kitten'.
A 15 year old Harry Potter and Hermione Granger were in the same room together with a potion in their hand.
Why you may ask?
Well at the age of 15 every wizard or witch is required to take this potion to test for a creature inheritance. How it works is that it will force you into the creature forever. Not very good I know but creature inheritances are very rare, only happening with purebloods and half-bloods with not only creature blood in them but enough magical power. It doesn't happen with muggleborns because you if it does happen with a muggleborn, then they aren't really muggleborn, because muggles can't have creature blood in them otherwise it would kill them so they would be at worst a half-blood, in they eye of the pureblood bigots anyway, and at best a pureblood with both of your parents being squibs.
To add some extra information, most creature inheritances are people with humanoid forms such a vampires or even werwolves and naga, but there is never, to this day anyway, been an inheritance with a completely animalistic form like that of a hippogriff or a griffon.
"Are you ready Harry?" Hermione asked nervously.
"Ready a I'll ever be." Harry answered.
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They both swigged down the potion and within seconds they found themselves in extreme pain. They both felt their bones crack and rearrange. Their muscles rearranged themselves into a more quadrupedal form. Jaguar fur and black spots seemed to grow around their bodies and while Hermione felt herself grow, Harry felt himself shrink. A small snout seemed to grow from their heads and a tail appeared on them.
The pain was so much for Harry that he passed out but unfortunately for Hermione she stayed awake until the agonizing transformation had finished.
Internally groaning at the ach still present around her body as she stood shakily on all four and looked in the mirror and was shocked to see her new body.
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She was a 4 metre tall and 8 metre long Nundu! Arguably the most dangerous magical beast in the entire world. For those of you who don't know what a Nundu is it is a class XXXXX creaturethat has a breath filled with so much disease that it can annihilate entire villages an takes 100 trained and experienced wizards to subdue one. Notice that I said subdue, not kill. To accomplish that feat i a whole other story that I'm not about to get into. It also has venom in it's teeth similar to basilisk venom and while not as fast acting, it is slow and painful but you would hardly have to worry about that because you'd probably be in it's stomach or dead before the venom could even kick in.
She looked over to Harry and felt newly formed instincts kick motherly instincts.
Waht she saw before her was a newborn Nundu. 1 metre tall and 2 metres long. You may think that's big but Hermione is what you would call an adult and she is massive.
Her new instincts overpowered her easily with the objective, protect, love and nurture.
She walked slowly over to Harry, or as her instincts said, kit, stumbling a bit as she was new to the whole walking on four legs but she managed to get over to Harry who was sound asleep and curled around him to act as warmth for her kit.
'Why am I thinking thinking of Harry as my kit?' Hermione thought. She wanted to ponder this further but she found herself growing drowsy and eventually succumbed to the embrace of sleep.
