Fisting. It can be done right or wrong, if it's done wrong, she will never want to do it again!
Fisting does not have to be literally about 'fisting ' as in, the whole fist and half your arm up there, so stop worrying about losing a braclet or watch lol!
Heres what to do:
Make sure your nails are trimmed with NO jagged edges.
Get some KY Jelly. There are other lubes out there, but KY is the best.
Apply KY to your hand. Apply KY to her vagina inside and around the entrance.
Do some usual foreplay with thouching and caressing and oral sex. (or which ever one she likes best).
Start by sliding one finger in and out, then progress to two, then three.
Then stop, hold it there!
Keep three fingers in and gently move in and out, rotate around, push in and out.
Now she needs to switch on a bullet vibe like the bang bang bullet or a mild to moderate mini vibe preferrably with a single speed and start to stroke her clitoris with it. This will make her relax and the pleasure will stop her tensing.
NOW go four a fourth finger, in and out, slowly, twist around again, while you are doing this your hand needs to be in a narrow shape (forefinger and little finger leaning in to touch middle fingers to make your hand narrow).
Press your thumb tight to your centre palm and then push in again, out, rotate, in and out, slowly and gently.
You are now in up to the knuckles.
Push gently again but if she feels pain, STOP PULL BACK A LITTLE AND GO AGAIN - GENTLY.
If you still feel resistance, thats as far as you can go. Wide hands will not fit inside sometimes! (That's why porn actors doing fisting scenes often have slender hands, have you noticed that?)
If this is as far as you can go, concentrate on the pressing gently against the entrance and twisting gently around, the stretching sensation alone shud be enough with the bullet in use as well, to give her a good orgasm.
Fisting does not have to mean taking the whole hand, many people (myself included) get mind blowing pleasure from simply feeling a partners hand stretching down there. Which is still fisting even if the whole fist is not involved.
This should help you to achive the result you both want, so try this next time you have a go at it. And remember fisting is patience and skill and technique, but that's only 20% of it - the rest is TRUST so as long as you are both relaxed, gentle and careful, and go slowly, it should be good for you and mind blowing for her.
All the best and I hope this helps.
Source of my advice: An 18 month relationship with a former lover who used to fist me vaginally and anally. He never got past the knuckles either but it was amazing, because it was slow, careful and he did all the things I listed above.
Hope this helps a lot
Cj posted this but wouldn't let me share the link. Was great advice x