MAsterbating

not much to say on positions if you aren't wanting to put anything inside of yourself. All there is to do is alternate between massaging your clitoris and labia majora (the outer lips), or you could try using one of those vibrating muscle massagers on your privates, also, try stimulating your nipples and breasts for that added euphoria.

try using both hands.
Put one finger on your clit then with the other hand, put one finger under your clit (or anywhere in that area) then move your fingers in different directions. This works wonders.