She makes a soft, amused sound, and murmurs mostly to herself, "Welcome to hell, sorry about the tentacle porn. If I was smart I would've brought a bucket to puke in."
Then she straightens up a little and says, in a more serious voice, "Everybody knows about the fairy ring in the forest behind the school."
The story is long and kind of upsetting although, despite her warning, the version she tells here does not have nearly as much explicit tentacle porn.
It's weird how she keeps finding all this polished prose flowing off her tongue, but she can't find a good spot to interrupt the story in order to remark on it.
She blushes slightly when she gets to the tentacle parts. It doesn't slow her down, though.
When she gets to the first time one of the Cave Things makes a noise, she does interrupt herself, to say, "—you don't need to hear it. But I'll tell you what it was like." Then onward, through the sound, through what it felt like to hear it, through the aftermath where every other priority seemed totally insignificant next to the all-consuming need to never hear it again.
But she did hear it again, of course. When she describes the second time, she has to pause to wipe tears from her eyes; her voice shakes a little with the memory of despair. Because, she explains, "Once could be a fluke or a warning or a test, once could be a one-off, but as soon as they do it twice, that's when you know it's staying on the menu."
And so it went, alternating uneasy sleep with tentacle rape, with occasional appearances from the Worst Sound In The World. There were times when she was sleeping badly enough that she's not confident anymore which of the things she experienced were in any sense real, and which were just her brain getting confused about its inputs. They never let her go on too long like that, though; eventually they'd always give her enough of a break to leave her well-rested again.
She got to the point of starting to recognize individuals, or at least to think she might be recognizing individuals. It was easiest, unfortunately, when they made sounds; every one of them had a unique distinctive voice. She thought there might be five or so but she wasn't sure. Some of them, she was pretty sure, never made noises at all.
Right from that first time, when she thought she saw tentacles bursting through her stomach and then woke up to find it completely unmarked, there was an undercurrent of unexplained impossibility to the whole thing. Sometimes things happen that just don't make any sense, that shouldn't be capable of happening.
The first time they teach her a word of their language is another of those, more blatant than any before, because it involves the creatures phasing their tentacles into her brain.
"—and on the one hand, right, that's almost an explanation, if they can just phase through things, but on the other hand—I shouldn't be able to feel it, and I can sure as hell feel it—for the record, it does not feel nice—and this time I think I have to tell you what they said, because this time they weren't just singing. They told me their name for themselves and made me understand it. They call themselves—" and she hesitates, bites her lip, takes a deep breath, preemptively digs her fingernails into her palms, and makes a very, very, very bad sound.
She says it as softly as she can, so it's not quite as bad as that memorable first description implied. She still has to sit there for a solid half-minute afterward just taking deep breaths and focusing very hard on not throwing up, while the humming echoes fade from her bones and the fresh sense-memory fades from her thoughts.