Short story (9787 words)
Lulu and Selena have been meeting in hotel rooms for six months to have casual, friendly sex. One day they realize their situation is the perfect opportunity to try out their fantasies, because the consequences of something going wrong won’t be that great. They lose a friend, nothing worse, so they really ought to try.
They decide they will, but at the last minute Selena gets nervous, and isn’t sure she wants to. They talk, and she changes her mind, and admits what she wants to do. Selena wants Lulu to have sex with someone, a stranger, someone Selena will know and Lulu won’t, ever.
It might be Selena, but it might not, and Lulu is disturbingly excited by the idea, and agrees to try.