How about Mostly Harmless (http://intimations.org/fanfic/stargate/MostlyHarmless.html) by astolat? John and Rodney get raped by Tribbles and enjoy it.
"Oh my god," John said, as his pants got opened and his jacket got unzipped and the feelers started wandering over his bare skin. They felt bizarrely soft, silky and frictionless, and the air was smelling like a kitchen full of baking and flowers, and he was not not not getting turned on by the crazy alien monsters, even a little, no matter how long it had been --
"Oh my god, yes," Rodney said, sounding drugged, blissful.
"Rodney!" John turned his head and stared over at him outraged.
"Oh, shut up, this one's practically giving me a handjob, what do you want from me," Rodney ground out, eyes shut, and shuddered; his cock was jutting out of his boxers, thick and wrapped around with the delicate feelers.
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"Oh my god," John said, as his pants got opened and his jacket got unzipped and the feelers started wandering over his bare skin. They felt bizarrely soft, silky and frictionless, and the air was smelling like a kitchen full of baking and flowers, and he was not not not getting turned on by the crazy alien monsters, even a little, no matter how long it had been --
"Oh my god, yes," Rodney said, sounding drugged, blissful.
"Rodney!" John turned his head and stared over at him outraged.
"Oh, shut up, this one's practically giving me a handjob, what do you want from me," Rodney ground out, eyes shut, and shuddered; his cock was jutting out of his boxers, thick and wrapped around with the delicate feelers.
Pure crack.