How about some reimaginings of slasher movie scenes, where the slasher actually follows through on the implication?

Like Nightmare on Elm Street, where the claw pops up between her legs in the bathtub.

Or the Texas Chainsaw Massacre scene, where he puts the chainsaw between her legs; except it doesn't jam in this one.—– actually I can think of a lot of things that can be done with Texas Chainsaw Massacre.

Like one where a girl wakes up naked. She sees another naked girl sprawled out on a table, with Leatherface's head between her crotch. As he lifts his face, it's revealed he was literally eating her out. He then turns his attention to the PoV character. He grabs her, impales her neck on a meat hook and proceeds to rape her. She ends up wrapping her legs around his waist, just to relieve the pressure on the hook. After climaxing, he finishes her off with a chainsaw between the legs.

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Could also do one where an group of lesbian college girls have a vacation at Camp Crystal Lake.

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Or a Jigsaw copy-cat chains up 2 twins, I'll leave the ages up to you. One of the twins has the key shoved into her womb, and the other has to get the key out with her mouth.