A chunk the shape of a giant set of teeth disappears out of it immediately. In five more bites it's gone entirely, save for a puddle of blood, and that disappears too after a few moments. 

"Bon appetit," he says belatedly. "Okay. So this is Massachusetts but it is not the Massachusetts I'm familiar with, do you by any chance have a guess about how to explain to someone who's heard of Massachusetts but doesn't expect anyone to be invisible the inferential gap implied?"

"...I'm tempted to say 'there are more things in Heaven and Earth, Horatio,' but I have no idea what you are or what you meant by angel so perhaps there are simply different things. We don't know everything--Grandfather had books about things shrouded from the common knowledge of mankind, but they're old and in poor repair and in some cases incomplete. We know there are--places, besides Earth, places where things not made of ordinary matter dwell, things like the Hounds of Tindaloo and the Adumbral Hornets--the latter is what I was trying to summon when I got you--or like our father, Yog-Sothoth. We know bits of the language that beings like Yog-Sothoth and its kindred use. We know that Yog-Sothoth and other things like it are bound from fully entering this dimension and if they did it would mean the end of life on Earth as we know it. We know about an ancient civilization that used to dwell at the South Pole before its own created slave-race rose up and destroyed them. We know about an aquatic sapient race that inhabits the oceans to this day, or at least to the day the Necronomicon was written, around the eighth century." 

"...okay. I'm a demon. Angels also exist. So do fairies. All three of us live in our own separate worlds but can be summoned to Earth-as-I've-historically-understood-it by humans drawing on the floor, and then negotiated with for our services. Demons make things, angels change things, fairies move things. Uh, also it's the year 2159."

"It's the year 1928."

"I'm reasonably sure that on my Earth people were not invisible even in 1928 - though the reverse isn't a compelling case; daeva like me were not well known before the early 2000s - so I think this is an alternate universe, not time travel."

"--May I have another cow? Or a deer or a pig or something? It's only I haven't eaten in days, and--" she breaks off, hesitantly. 

Cow! "I can just keep doing that as much as you want. I mean, kind of. If you grow faster the more you eat then we'll have an exponentiation problem."

"...No. I don't think so. No more than--if I die I'll stop growing. Probably." Cow disappears in a briefly but intensely gory way.

"All right. Is two cows plenty? Did you have to give up rabbit because they were too inefficient to catch in quantity or anything?"

"Two cows is enough for now. Rabbits are really good at hiding and animals don't like me; the last time I tried hunting rabbits I was much smaller and I still tore up enough ground that Grandfather would have had to explain it if anyone had seen." 

"Your existence is not common knowledge?"

"No. People think Wilbur is an only child. They think he's just the product of inbreeding or something. It has to stay that way, people would kill us if they knew--"

"Kill you? Why?"

"Are you kidding? Down south they lynch people for having the wrong skin color and looking at a white woman funny!" 

"Yes, but that's different from being large and invisible! I don't know the current oppression status of large and invisible people. Do people know that large and invisible people even are a phenomenon?"

"No." 

"So there is no actual oppression status, you're guessing conservatively - which is reasonable, to be clear."

"And I'm ugly. I guess it seems strange to say that when I'm invisible but I know how I'm shaped, I know what people would see if they could see me." 

"Unless you show up in photographs, I'll have to take your word for it."

"I don't know. But Wilbur knows how I'm shaped, he's drawn me. If you promise not to--to hurt me for being a monster." 

"I don't go around hurting people for being anything. I'm not perishing of curiosity if you'd prefer not to though."

"I don't like my body." 

"Unfortunately when I went to medical school I only learned to do things about conventional human bodies so I can't promise I'll be able to do anything about it. Not being able to see you would also be a serious drawback even if I were going to try it."

"I really don't think you could fix the things I don't like about my body."