"I don't know who you are and I found you in my bedroom. Explain."

"I'm - I'm Soph. I'm Sophia."

"I don't know anyone named Sophia."

[...Sherlock? Bella's gone nuts.]

[In what way has Bella gone nuts?]

[She - she doesn't know who I am, I thought she was fooling the first few times she asked me who I was and what I was doing in her room but I think she's serious. She's interrogating me in some random - place - it's cold as balls - she says she doesn't know anyone named Sophia.]

"Do you know who this is? Because I don't, but she was in my room anyway, and there was an extra bed in it, and stuff that doesn't belong to me, and I know I haven't been home as much since I stopped needing to sleep but I'd think Charlie'd tell me before taking in a boarder."

"I'm Soph," says Soph plaintively.

"She's your fucking sister, love."

"I don't have a sister. I have never had a sister. I am an only child, like all the other Bells except Aurora!"

Soph starts rubbing at one of her eyes unhappily.

"You are not and have never been an only child," says Sherlock. "And if we're going to have this conversation, I suggest we have it indoors."

"She was for, like, a year," says Soph.

Bella looks skyward. "What, you want to go talk about this in a Jarvis, I have no idea what she is, because she's not my sister, I have a completely coherent set of memories from where the perfect recall kicks in all the way through ten minutes ago with no sister, frankly I don't want her anywhere near a being I like that physically can't torch while we can't get Downside."

"And I have a perfectly clear set of memories from the day I met you that include your sister, and I assume your sister can say something similar, and here she is. Until ten minutes ago you've never had a problem acknowledging her existence. Something has changed, but before we find out what I am not going to advise treating Soph like a hostile fucking demon."

"Of the two of us I am not the one likelier to be affected by mind-affecting magic!"

[...Is this a trick question?] says Tony. [One.]

[I am an only child! I always have been! None of you are mentally opaque, something must have happened to you.]

[We've met Soph,] says a Jarvis. [You can watch the video yourself. I don't know of any spell both powerful and sophisticated enough to alter my recordings. A mind-affecting spell might alter my personal memories, but the data I have on file is a separate matter, and I'm verifying the records as we speak.]

[Yeah, she's got a bunk bed in my room too, but why and how would somebody go through my memories - my protected memories - to subtract a sister?]

"I'm cold," murmurs Soph.

"If you were my sister I would've wished you up protections, like Aurora gave Lexi, and you would not be uncomfortably cold! We're only in Canada, not the South Pole!" Bella points an accusing finger.