Scenario: You hear about it all the time, but it never really happens, does it? Realities don't just collide with one another and strand someone in a place or time they don't belong? That's no what happened to Jacob. No, he's just a run of the mill computer programmer, a faceless number at a massive corporation. His reality is safe, but he's about to find it a lot more interesting when on his way home from work one night he almost runs into a mysterious... elf girl? Someone's in for culture shock... and she's bound to be confused too.
Setting: Earth, this day and age.
Requirements: An elf girl (up for interpretation) to find herself in a strange new world.
Other: I can see this having a lot of story potential along with the erotic aspects.