"Mostly the magic. I have this... awareness, sorta, of my body, and it's all fuzzy around the edges. I can feel the capillaries if I focus on them, but most of the time focusing on the larger vessels takes care of it all."

"Try adding a little something with capillaries in it somewhere and pay attention to them, they might be taking your blood with them when they go."

Of course she was. "You added blood that time."

"What? Why?"

"I don't know but I want to."

"Okay... Let's see... The only difference this time was that I was paying attention to the capillaries... And... They weren't fuzzy anymore..." He blinks. "So I think maybe—"

He's interrupted by Laura's arrival! "Hi sweetheart, hello Addy. Much progress today?"

"Yeah! I made a tail!"

"Which was very impressive, but more importantly, he made blood and then got rid of it again, which he seems currently to only be able to do subconsciously. Work in progress."

"I can see why generating blood might be very useful, but why would getting rid of it be?"

"So that he doesn't burst like a balloon after doing a lot of the generating part."

"Ah, yes, that would ruin the carpet," she says amusedly. "In any case, I'm sure he has taken up enough of your time for today."

Addy is not literally incapable of taking a hint! "See you tomorrow, Sadde." And off she skips.

"Ooh, what'd you figure out?"

"If I dump the blood into other more solid tissue it gets reabsorbed with it. My magic was doing that when I wasn't paying attention, but when I did pay attention it kept the blood in the actual vessels. I think if I ground up the bone from yesterday into powder I could reabsorb it too."

"I can do that and bring it back tomorrow if you want to try. I could also bring you some other powder and see if your magic rejects what wasn't yours to begin with."

"Oooh good ideas! How are you gonna do it?"

"Remember how I," boop, "have your witchcraft?"

"I mean how are you gonna powder it in the first place?" Pause. "I wonder if I can just reshape bone into powder."

"Ooh, could you? Be careful you don't wind up losing bits you don't know how to reabsorb yet in any of your more crucial systems, but that would be very interesting."

"No, look!" She shows her right palm, and a circle in the middle slowly solidifies into bone, then starts growing. "I figured, given the extent of what I can do, there's no reason why bone should only come from bone. Magic agreed."

"Ooh, lookit you. Best prodigy witch."

"You can do capillaries and cone cells but not pulverized bone, really?"