clean hands, short trimmed nails...
technique I like..
with palm on top of mons pointing down (obviously after some nice clit stroking and labia stroking to make sure she's all wet) insert middle finger (like she's a bowling ball) about 3 inches inside and then push upwards towards belly.. be firm but gentle, you may need to explore a bit but when hit the right spot - you'll definitely know it. Once you've found it - she will let you know when you're there, masasge, insert more fingers if nexxessary, respond to her reactions, a rocking motion and not thrusting is also better IMO - fingers really aren't made for fucking in that way.
Have fun
