I thought about an erotic story that starts with alien abduction and then got to thinking just how many classic paths are there to take from that set up: a) "Mars needs women (and/or men)" scenario where the aliens abuct humans to have sex with them. b) "Activate the probe-o-matic!" where it is not the aliens who have sex with humans, but their machines. (Sufficently weird enough science is indistinguishable from sex) c) "The Aliens are really alien" which is like scenario a, but aliens could be tentacly type or gooey or anything rather than humanoids. d) "Voyeurs from beyond the stars" where the aliens adbucted people to study them and (since this is an erotic story) they want to see the humans mate in lab conditions. For added spicyness, they kidnapped family members or other people who would not normally have sex with each other. e) "They want to get *inside* us" where the abducted human is implanted or otherwise modified and corrupted to become a tool for the aliens or a hybrid. Usually then returned to Earth to corrupt more humans. f) "Adventure ho!" the human joins the aliens in an epic journey across the stars, possibly becoming the last starfighter or some other type of hero. ...And they also get to have space sex with space aliens. ...Too many ideas for just one story.
Unsurprisingly, idea e is closest to the succubus stuff that I have written mainly on CHYOA and is the one that I most likely will go for if I start writing this story. But I wonder if I should go for something different just for the sake of variety?
g. Alien zoo. Several humans are abducted and put in a earth like habitat. The zoo rewards its humans for preforming human like task for the guest. Problem is most of the aliens knowledge of earth comes from our internet.