Mind Rape/Fan Works

Psychic Assaults
"Hayate:"
 * In Aeon Natum Engel.
 * In Arabella's fanfic "The Very Secret Diary", all of the gruesome mind-rape that probably went on between Tom Riddle and Ginny Weasley in the second Harry Potter book is detailed to an uncomfortable degree. It's damn fine writing, though.
 * In Harry Potter and The Methods of Rationality, does this to the auror guarding him. By humming.
 * In The Return mind rape is Alexia's favourite recruitment tool. Convert someone into a succubus and mindrape them into submission.
 * In Forward, the "Inducer" type of psychics do this to people. The Academy has to keep them constantly sedated and under guard by combat drones or they'll drive the research staff insane, and this is mostly the ones who are too insane themselves to control how they influence minds. The ones who know what they're doing and understand how to influence people's minds can do far worse.
 * In the "Charity" story arc, this one almost becomes literal rape. An Inducer makes  sexually attracted to one another to keep   distracted. They almost do the deed on a pile of crates right after surviving a fight with a small army of mercenaries, before   realizes something is amiss. The chapter afterward involves   being directly mindraped repeatedly when she confronts the Inducer behind it all, and it ends with the Inducer taking control of her.
 * In the subsequent story arc, it gets worse. When  manages to briefly regain control of herself, she tries to fight back. The Inducer in question becomes pissed off and proceeds to brutally crush her mind by alternating between intense grief and guilt and intense pleasure and satisfaction.
 * In XSGCOM, this is standard procedure with every alien they don't consider "to valuable to cause brain damage". Yeah, X-Com are ruthless
 * Alicorn's Luminosity includes:
 * Chelsea, a witch whose power is to sever and create relationships--which she does mostly to make people care about her. And you don't feel it happening.
 * Due to a series of events and Mega Manning, Addy have the ability to do this with true memories. There are things people would rather not know, much less experience.
 * In the Negima and Nanoha crossover Equal and Opposite Attraction, Mind Rape seems to be on the menu. Its happened twice. Once with Arf when she was And again with

"Applejack: Ponyville used to be the nicest, simplest, all around friendly town ya could hope ta settle in. But now it's feelin' like a little filly whose lost her innocence a little bit too soon."
 * Nyx receives memory fragments from Nightmare Moon wherein she wants to kill Twilight Sparkle... the pony Nyx considers as her mother.
 * While the canon version of him's methods were (almost) too tame to count as this, the Pony POV Series version of Discord loves doing this. Everyone being Driven to Madness under his rule cases such psychological pain that pretty much everypony in Ponyville pretty much needs weeks of consoling and help to get back to some resemblance of their old selves . Applejack pretty much sums it up quite well:

"Thing (narrative): How little it knows. It knows even less than I do.
 * His psychic Mind Rape of persists weeks later and
 * The sexual angle is referenced when the Wonderbolts member Fleetfoot states that, because of what Discord did to her, she feels violated. Some readers even assumed it was ACTUAL rape until Word of God explained it. The worst part? Discord does every last bit of this For the Evulz.
 * Another Discord one from a fanfic: In The Elements of Harmony and The Savior of Worlds, during his original rampage Discord tortured Morning Glory's mind for days and days, leaving her almost completely unresponsive to those around her. And due to Rosedust isolating the Flutter Ponies in anger, Morning Glory spent thirteen hundred years like that.
 * The Thing, written by Peter Watts and nominated for the Hugo Award (so you know it's well written), is The Thing from the alien's perspective. Though Childs' status is ambiguous in the movie, in the fanfic he has been taken over by the Thing, and just before his mind is consumed the following exchange takes place:

Childs: "I know enough, you motherfucker. You soul-stealing, shit-eating rapist.""


 * Another Discord example: in Night of the Shy, though no details have been given yet, it's revealed by Luna that he mind raped her and Celestia's parents so far past the Despair Event Horizon that they lost the will to live and violently refused to be fed, allowing themselves to waste away.
 * In Fever Dreams Light does this to himself. He feels "defiled" every time

"Mundane" Torture

 * The Axis Powers Hetalia fancomic/fanfic, Taste of Revenge found here in comic form and fanfic form. (If you like the personification of the United States of America, Alfred F. Jones, please save yourself the guilt and disgust by not reading this. If you're not weak-stomached, go ahead and read this.) The basis of the story is that Alfred, or U.S.A. gets gang-raped by other countries for causing global recession, in the meantime getting seriously Mind-raped for all the shit he did in the past. It's a good read and worth your time, but the comic and the read is not Work Safe. The worst thing of it all, they think they're helping Alfred by teaching him a brutal lesson. Sure.... rape the world's last remaining superpower who has enough nukes to destroy you all. Real nice.
 * It was so severe in fact, that many members of the community posted requests wanting Alfred to get his revenge on them in some way or another, or at least make the nine of them realize just how horrible their actions were (which in itself is a Mind Rape) and watch them become overridden with guilt and desperately try to regain Alfred's trust and forgiveness (though whether they succeed or not depends on just how forgiving the author might be and how the story's tone is).
 * The Crack, aka Mind of a Hero, has Vlad use a device as an Emotion Bomb, which he claims will bring forth what Jung referred to as the shadow on Danny. To say that it didn't end well is putting it mildly. Both parties are still messed up about it seven years later to the point that Danny can't/won't have normal relationships.
 * Unlike the canon version, the Pony POV Series version of Discord's breaking of the mane cast is treated as this, though for some of the group more than others and in part due to the psychic effects. However, what he does to most certainly counts, as like Twilight, he doesn't need to do the psychic version and effectively  by illusions and a nasty Hannibal Lecture. Even after he's been defeated,  has been so psychologically broken she's still "Discorded" weeks later.
 * Her own reharmonizing chapter reveals this Mind Rape was so severe, it caused
 * For another example from pony-related Dark Fic, look no further than "Pattycakes". Part 1 has Fluttershy, saddled with a really creepy infantilism fetish, psychologically break Rainbow Dash and make her regress to a childlike state by forcing her to act like one until she totally gives up hope and internalises it. This takes...less than a day, and the most intense torture consists of forcing Dash to use a nappy and drink from a bottle, yet at the end Dash is completely convinced that her oldest friend is actually her mother and that she is let's go with twenty years younger than she actually is. Part 2 retconned it so that Fluttershy instead used a drug called "foalmula" to make Dash regress, and even lampshaded the rape angle to a degree by having Fluttershy comment that for Dash she'd abandoned her rule about only using foalmula for consensual age play. Things get creepier from there.
 * The Bleach AU Winter War had Aizen use both the Hogyoku and Cold Blooded Torture to  to the point of generally unquestioning servitude, though final results depended on the individual (and were horrifying no matter what).