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One fateful night, Kaguya and Mokou are at it again, the two immortal enemies blowing the hell out of eachother for fun and spite. To make sure they're not disturbed, Kaguya has set up a barrier; can't be broken from the outside, can only be opened from the inside by her, and time is dilated to pass eternally within it without passing at all outside.
Her decision has doomed them both.
Unbeknownst to either of them, a tentacle monster lurks beneath the site of their duel, also trapped within the barrier. When the two eternal rivals have tired eachother out, it strikes, quickly consuming and restraining them both, then proceeding to tickle them mercilessly. Their continued jabs at eachother are quickly overrun by agonized laughter, made worse when they realize the creature is draining their strength with it's assault, and when Kaguya explains to Mokou that nature of her barrier.
Rescue isn't just impossible, it's never coming to begin with. Not even a second has passed outside. Escape is just as impossible, the tentacles are too strong and keep them too weak. And, thanks to their Hourai immortality, both death and complete insanity are impossible for them as well. This will never, ever end. The only possible change is for it to get worse.
The dread begins to set in just as the tickling gets more intense.
Time passes.
The two girls have completely lost track of how long they've been trapped and tickled like this. Not that it matters, it's never going to stop anyway.
Mokou's fire has completely gone out, miserably begging for mercy, death, for Keine, anything but this.
Kaguya, in moment of clarity, ruminates on their fate and it's implications. The monster has gotten steadily stronger as it tickles energy out of it's immortal batteries. Not only has the tickling gotten more intense, but eventually, inevitably, the creature will grow strong enough to break the barrier.
And by that point it will be unstoppable. Even without the barrier, rescue at that point will still be impossible, as the tentacles swarm over all of Gensokyo, effortlessly dragging each and every denizen of the realm into this nightmarish tickle hell. Eirin, Reimu, everyone.
And even eons from then, when those girls eventually expire, Kaguya and Mokou will still be right where they are now, tickled mercilessly, every minute worse than the last. Forever.
Then the moment of clarity passes, and Kaguya wails in despair and ticklish agony as the torture overwhelms her once more.