Sexual Fantasy?

To seduce an older,librarian-ish woman who is quite awkward and shy and to conjure up the inner slut in her. This woman often will have a bookish face(bespectacled) but a slammin body hidden by a white blouse(the buttons are holding on for dear life) and a black dress that outlines some wide,sultry hips.....Oh man, I'm gonna bust a nut!