Teacher Teacher
A Sexual Fantasy
I have a fantasy about a man teaching his two lady friends (in my mind usually one is a vaguely experienced bisexual and the other is a newbie) how to sexually please one another. I just really like the idea of someone very shyly and tentatively discovering someone else's body with the gentle but firm instructions from a teacher, whilst the newbie gains a lot of confidence during the experience.
A flip version could be two primarily lesbian girls teaching a this kinda dorky (but hot ;P) man how to please women. One of the instructors would be super firm and aggressive whilst the other soft, as the cute guy gets the experience of a lifetime.