My favorite involves a rapist who is taller and stronger than I am, but who doesn't immediately physically overpower me. He abducts me and threatens me with a knife to keep me from fighting back too much at first, but he isn't brutish about it. He simply holds the knife to my throat in a playfully threatening way. He looms over me, standing far too close with my back against the wall. He starts with gentle touches to the jaw, face, wrists, neck, and other erogenous zones, going as far as the inner thigh, but not actually touching my genital region. He says things that are sexually threatening, but also arousing. It feels wrong for it to feel good, but it puts me at ease as he acts almost like a tender lover. Then, when my guard is down, he throws me over his shoulder and carries me to the bed. I'm startled and suddenly panicked, so I struggle, but he is too strong. He throws me onto the bed and uses his superior strength to hold my wrists together above my head. He binds my wrists that way. He undresses me, cutting my top off, since my wrists are tied and it can't be slipped over my head. When I am nude and pleading for him not to do this, he kisses me on the lips and then gags me. Then he has his way with me, in a forceful and somewhat painful manner, but also making sure that I orgasm so he can use it against me as part of his mind-fuckery. When he is done, he sows seeds of fear and doubt, telling me that it would be futile to report what he had done to me and making me believe it. I go home and try to forget about what happened, but, several days later, he abducts me and does it all over again.
I'm also quite partial to betrayal and sparring/fighting followed by rape. I'm straight as an arrow, but my female roommate managed to elicit squirmy feelings in my nether regions the other day when she and I were bouncing a conversation back and forth where we made up a scenario where I was a goody-two-shoes moral paragon and she was a villain who had been masquerading as my best friend. I also like supposedly friendly sparring matches that end in one party pinned against the wall or to the floor and then the winner has his way with the loser. I like it about equally well whether the pinned party enjoys it or not. I mostly like the lack of explicit consent in that scenario.
And I've got an auto-virginal kink. Because I am a virgin and I like playing up the significance of that in rape fantasies. I also find shower sex, anal sex, stranger breaking into my bedroom at night, and a host of other things arousing, but I've already exceeded the designation of my singular most arousing fantasy.
EDIT: Alright, I forgot one that I have to include. I'm not aware of such a thing existing in real life, but I like fantasizing about being drugged with a drug that lowers inhibitions but also lets me clearly remember the details later.
