The next day could be summed up in a list of things broken: one bathroom door, one blanket, one plate, and no less than twelve of Midoriya's bones.

Oh, and poor Inko's eyes if the constant tears meant anything.

It had started as Midoriya woke up. Rolling over he yanked his blanket off and watched as it ripped straight down the middle until he was holding a strip of it in his hand. His sleepy brain took a moment to register what had happened.

Huh. Maybe I should tell mom.

Standing up he padded down the hallway calling to his mother.

"In the bathroom Izuku!" Came the muffled reply.

He stood in front of the bathroom door and knocked. "Can I come-" His voice cut off as he watched his fist connect with the door and then continue straight through until it finally stopped on the other side of the door, a large hole showing his mother as she dropped the mascara wand she had been holding in the sink.

"Um. I ripped my blanket mom?" he said holding the strip of the blanket in his opposite hand.

There were splinters from the door all along his arm, blood dripping from it onto the towel Inko had given him, and the entire thing felt weird. Midoriya flexed his fingers experimentally and the weirdness intensified.

For your information the arm felt strange because it was broken in six different places in four different bones; but, what with a new quirk and all, Midoriya hardly realized there was anything wrong with it. Except for the splinters. There were lots of splinters. Which brings me back to my point.

Inko was on the phone with the specialist from the day before setting up another appointment as Midoriya sat on the couch looking at his arm.

"Yes. Okay. We'll be over shortly." Inko hung up and looked up at Midoriya. "Oh, sweetie don't mess with it." Midoriya had taken to absentmindedly poking at one of the splinters watching as the wound dripped a bit more. "Put the towel back on dear." He obliged. "Alright let's go get you ready. We're going to see the doctor again 'k?"

"I'm hungry."

Inko looked at the clock and sighed. "Okay but you have to hurry alright?"

A few minutes she set a plate in front of Midoriya who was struggling to hold his chopsticks in his non-dominant hand. Tongue out in concentration he brought them down to the plate and watched in wonder as they shattered the plate and stuck a centimeter deep in the wood of the table. Letting go of the chopsticks (which stayed firmly upright) Midoriya noted his fingers seemed to be responding strangely, twisting in odd directions.

Inko, in a strange sense of calm simply sat next to him and attempted to feed him herself. But as soon as Midoriya closed his mouth there was a large cracking sound. Inko inhaled sharply as she realized what the sound must be.

"On second thought maybe we should just go to the doctors now."

The doctor tapped his chin with a pen. "So from what you've told me, and what I can see for myself," he gestured to the boy in front of him who was, even after repeated chiding from his mother, poking at his obviously broken arm. "I think it's safe to say his quirk completely and utterly shuts off his pain receptors."

"But what do we do? I can have him constantly breaking himself! There must be some healing aspect to his quirk right?" Inko pleaded.

In fact, Inko was quite positive that there had to be; this was why she took Midoriya to the specialist first instead of going to a traditional doctor. That and the fact that Midoriya didn't seem to be in any pain.

"I'm sure there is! And I think I have a good idea of how it works!"

Inko let out a sigh of relief. "Oh thank goodness! How do we activate it?"

"We make his heart stop!"

There were a few seconds of silence before Inko began to sputter. It took several more moments before she was able to calm herself into a semi-coherent state, "Are you saying you want to KILL my son?!"

The doctor laughed. "No no no no no! I would never do that!

Inko breathed deeply in relief.

"-without proper precautions."

Inko stopped breathing.

The doctor walked in a few minutes later with a woman at his shoulder. "This is my friend Arai. Her quirk is revival. She can resurrect anyone within 30 minutes of death, but if my theory is correct we shouldn't even need her!"

Inko made a sound like a choking duck. "Is this really necessary?"

"It's important that we find the exact parameters of Izuku's quirk so that we can better know how to control it. This is the safest way to do that!"

"Well… I suppose if it's for his own well being…"

"Brilliant! I'll get started right away!"

The doctor then pulled out a three-inch-long knife and a grin that really shouldn't be on the face of anyone with a weapon in hand talking about killing a child. With that thought, Inko once again started to feel faint. "That seems rather- violent."

"You said his blood interacted strangely, I'd like to see it in person. And a gun would make far too much of a mess. This is the best way, believe me."

Inko swallowed hard and nodded hesitantly and then watched in horror as the doctor slit her son's throat.

The doctor told her she had regained consciousness shortly after Izuku. He also informed her that the blood had turned gold exactly as she had seen the day prior. That was as far as he got before Midoriya ran up to her and flew into her arms chatting excitedly.

"Mom! He cut me with the big knife and it made my voice sound funny and then it was dark and then it wasn't and look, Mom!" He held his arm up and then pulled his lips apart to show how each wound had healed. "See! The blood is gone and it's not weird! An ma teef awre bewder too!"

"That's wonderful sweetie," Inko exclaimed, feeling a bit overwhelmed.

"Yup! Seems my hypothesis was right! You see quirks often have two parts to them, the actual quirk and the safety against them. For example, the pro hero Endeavor. His actual quirk allows him to produce fire and the safety keeps him from burning himself. In the case of Izuku, his quirk is what I would like to dub Adrenaline Rush. In essence, his body is constantly producing a varied form of adrenaline which does two things; first, it keeps him from feeling any pain, and it also keeps him in a near-constant state of hysterical strength making it hard for him to use anything less than 100% of his body's strength even if it causes him harm.

"The safety measure would of course be that incredible healing of his. It seems that the healing is only activated once his heart stops and needs his blood to heal itself. After about five minutes he comes back completely healed and fine!"

Inko just blinked.

"Sorry for rambling." The doctor said shyly. "It's just this is really interesting! If you're okay with it I'd love to have a few more appointments with Izuku to run some tests, free of charge! It would just be a pleasure to see such an interesting quirk in action!"

Inko nodded. "Yeah… okay, sure."

"I'll write everything that I found down for you soon! Oh! And before you go, I don't think it would be bad to er- help his body meet the healing requirements when he gets injured again. It should work just fine and would keep him from being too uncomfortable."

In a daze, Inko just continued to nod. "Yeah, I can do that. Just kill him. I mean he'll come back so it's not really…" she trailed off before snapping back to attention. "Ah! Well. We'll be on our way then."

"Of course! Feel free to contact me if there are any changes!"

As they were leaving the room Inko spotted the coating of gold glitter on the floor and thought about what the doctor had said. "Help his body meet the healing requirements when he gets injured again." When. Not if, but when. Inko sighed. She was going to be sick of the glitter very soon.