I took my drunk girlfriend dogging

My girlfriend and I have been together for three years. We are both in our early 20’s.
I would describe her as slim with small boobs with short dark hair. She has always been shy sexually and is even reluctant to undress in front of me! I put this down to her religious parents.

We had the usual boring sex maybe once or twice a week, and it was always at my instigation. 
On my birthday we went out for a meal, and during this I ordered a bottle of wine. Now my girlfriend does not drink, but that night I pursuaded her to have some. When she had drank two glasses, she seemed to come out of her shell and just kept drinking. I ordered some more just to see where this would lead. Well by the end of the meal she was obviously drunk and I started to get some devious thoughts.

Just down the road was a large park, which I knew was a notorious dogging spot.
We drove down the dark lane to the park, and as we pulled into the car park I spotted several parked cars. My drunk girlfriend asked where are we? I said perhaps we can have some naughty fun as it was my birthday. Well she surprised me totally when she reached down and pulled my cock out and started playing with it.

Wow I thought, she is drunk! I asked her to take off her top, and she did so straight away and then took off her bra without me asking!