Deku's Little Sister?!?!?

Prologue

You are Y/N Midoriya, Izuku Midoriya's little sister, but you prefer to just be called Y/N. You are a year younger than Izuku but you two were inseparable growing up. However you haven't seen your brother in a very long time.

See, you are a bit different than most people, more specifically your quirk is a bit different than most people's. You don't have full control over it, which makes it more dangerous than it already is. As a young child you always found it so difficult to keep calm, and when you got angry your quirk took over, which was never good.

Your bones bend and twist until they snap into place, you organs shift into place, your fingernails turn to claws and your skin grows large amounts of fur. This was your quirk.

You, Y/N Midoriya, could become a wolf. But not willingly, it only ever happens when you are angry and then you don't have control over what you do. Your mother tried to teach you breathing exercises and ways to control your temper, but once the bullying started at school, it never lasted long.

Because you knew how dangerous you could be, you tried to keep to yourself. Your only friends were your brother Izuku and his friend Katsuki. But they were a year older than you so they weren't in the same class as you. So you sat alone all the time and didn't play with the others. They saw it as weakness rather than mercy and started picking on you.

You tried so hard to be nice, so hard to not be mad, so hard not to hurt someone. Adults always tell you that if you ignore your bully, they will eventually get bored and leave you alone, but every time you didn't react, it got worse and worse.

One day it got particularly bad, they hit you, tripped you up and called you names the whole day. You didn't say anything and just cried silently in your seat when they weren't looking. At the end of the day you thought it was over. You started to pack your bag, but the bullies came back over. You stayed quiet as they riffled through your bag, afraid of what would happen if you lost your temper. That's when a boy took out a stuffed bunny you always carried with you.

It was dull and worn out from all the adventures he had been on. His name was Mr. Tickles, and aside from Izuku and Katsuki, he was your bestest friend in the whole wide world. Your Mom had gotten him for you when you were 3 years old, after you got your quirk, he became one of your biggest comforts. You would rub his ear when ever you got anxious, you would grab his two legs and make him dance when you were happy, you would rub his small little head against your cheek when you were sad and said he was giving you kisses. And when you were angry, you would wrap your tiny arms around his fluffy body and squeeze him so tightly to your chest, and you would calm down.

And here he was, being tossed around by a gang of monsters. You simply couldn't stay quiet when your best friend was in trouble. So you demanded his safe return. The bullies were so amused and proud of themselves for making you talk, that they got rougher with the poor bunny. You got more stern, demanding for the last time your precious friend back. That's when you heard it, the sickening rippppp. Your heart stopped and the room fell silent.

Your teary eyes focused on the injured bunny on the floor, his limbs askew and his torso torn in half. No one said anything until "Pftttt-HAHAHAHAHA". The boy laughed at the dismembered corpse of your most dearest friend. And once he started, everyone else joined in.

The last thing you remember is carefully picking up the tattered teddy and holding him close to your heaving chest with your shaky little arms. Only this time it didn't work.