I've been experimenting with masterbating since I was 13-14. Some I tried have been really satisfying...others did the job, but won't be a second time.
My favorite right now is to place a condom in a cardboard tube, fill it with water and freeze.
It's sensational to use after some clit squeezing and rubbing I peel the condom from the ice dick, spread myself, and gently start entry. At first it's not quite painful I want it and I dont; after a minute or two I'm sitting straight up holding it all in, rubbing my clit on the base of my thumb. 'BANG' I'm come gone and went back again
If you decide to try this I suggest sitting on a towel...it gets very wet