First of all I think masturbation is the most fun a person can have. You hand is always willing to do the work for you.
You would have to start with silk panties, and a dress. Fully clothed to start but i would not have you wear a bra. Maybe a summer dress that can easily slip off when the time is right.
Before you even touch yourself between your legs, go to a mirror and admire how good you look in the dress, then slowly rub your stomach, hips, and rear. Feel the warmth developing. Next slowly bring your hand up to your breasts, taking the time to feel your nipples getting harder, maybe give them a little pinch. Feeling warmer now you can lift up your dress so you can see your panties in the mirror. Lower your hand until it is placed over your mound. Leave it there without mouvement for 10 - 20 seconds, the move your hand slowly up and down feeling the silk of your panties rub up against pussy. Continue rubbing slowly and lightly until you really feel your panties getting soaked with your pussy juice.