I just came up with this idea and let me tell you, it's to die for. First off, read some stories on here or do whatever gets you aroused. Then take off you clothes (in the bathroom) and play with your clit a bit until you start to get nice and wet. Find two similar sized objects, mine are just small (no thicker than a thumb) smooth plastic things that I found in my bathroom (make sure you clean them well before doing anything, cleanliness is important. One is my Venus shaver handle, and the other is a little brush with a smooth small handle.
Get into the tub, and turn the faucet on. Place your cunt, dripping with anticipation, under the running water. AH, it's just sooo good. But it gets better. Stay like that a little while, let the water play over your whole pussy and your clit. Then, take those two weapons of choice, whatever they mmay be, and place them one at a time in your pussy and your ass. Place them so they can rest on the wall of the bath, so you can freely pump yourself onto them. Your hands are free, you can either play with your nipples or hold your labia wide open for stronger exposure to the water on your clit. I also find that pulling up on my pubic mound to expose and stretch more of my clit while the waters runs on it is amazing.
So, there you are, something working it's magic in your ass, your pussy, your clit, and your tits. Fantasizing is great along with this. Be careful though, it's pretty rough. You will experience the MOST powerful and incredible orgasm ever. I know I sure did. I must try this again. Actually, I'm really wet now from writting this, so I'm going to go take care of that. Happy jacking and jilling, ladies and gentlemen.