Nude Undertale:

• Like Undertale, but everyone is nude and wants to fuck Frisk.

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Muffet's Secret Recipe:

• Muffet discovered Frisk's breast milk tastes delicious when baked into her goods. So she wants to tie Frisk into one of her many webs and not let her out until ever drop of milk is traded for every coin in the underground.

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Sans vs Frisk:

• Like Flowey, Sans has high level of Determination which he can use to buff himself or teleport around. With this he is able to fuck Frisk in ways she never thought possible.

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Aphys/Flowey's experiments:

• Science requires experimentation. And with a nude Frisk that rarely says no, she is perfect for many, many, naughty experiments.

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Asrial the Hyper-Death-God:

• After absorbing the Determination of Frisk and the unnamed hearts, Asrial has limitless powers and the ability to do as he pleases. So, obviously he is going to use this power to fuck the pet Frisk until she becomes a brain dead pile of mush.

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Toriel's Tutorial:

• Frisk might be a willing pet slut, but she doesn't know how to be a perfect pet slut. Torial on the other hand knows how and wants to teach Frisk the ways of loyalty.