Undertale AUs/Underverse:don't judge a book by its cover

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undertale Sans,underfell Sans and Underswap Sans and underlust Sans have beeb gathered by Ink Sans for a bit of fun with the other Sanses,but ink suddenly acts a bit weird and things go sexual.

this story will be rated T/R due to some mature jokes but i promise you that's not what you are supposed to expect.
anyways...
Also the following AUs are not mine of course!

This is my shortest story yet,hope you enjoy it!!