Hmm. This is a pretty broad request, since xenophilia can be defined as anything from an interest in other cultures and/or races to an interest in other species entirely.
It would help if you could narrow the parameters just a bit. Is the story science fiction, or fantasy based? If science fiction, are you contemplating extraterrestrials or simply scientific experimentation? All of these could (and have) been adapted to include tentacle porn, so that part of your request sort of goes without saying.