well you could either make it as a suggestion and tell him strait that you want him to fist you. or... you could hint to him sometime that you would like to try it (say something like 'hmm i wonder what it feels like to be fisted' and see what his reaction his. or.... while he is fingering you, you could tell him to slide another finger in, then another, then another, untill all of them are in and then maybe try getting him to go deeper so his whole hand is inside you.
hope this helps you, these are the only ways i could think of lol. good luck :-)
just straight up tell him that you want to do more and that you want him to use his whole hand!
just put his whole hand on and he will get the picture and you are off to a good night!
Put your hand on top of his and just move it like you like it.
