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. "I don't know, I guess we could just watch a movie or something." that would be good."Ross really didn't care what movie he grabbed, He was to hurt to even realize what any of the movies where. He didn't notice until they He started the movie that he grabbed broke back mountain. "I'm sorry I didn't even realize what movie i grabbed i will go change it." ross said rushing to the TV."Oh no it ok i like this movie." shaun said.Ross sat back down feeling a little uncomfortable about this whole. I glanced up to see how Kirsty was taking things, if her eyes were any indication she was in shock but I pressed ahead, after all this was the easy stuff.I went through the lunchtime dare step by step, how Liz had paraded in front of me with her skirt around her waist, her knickers and stockings on display just for me. I was staring at Kirsty as I told her how that dare had finished, with Liz wishing she'd failed so she could be spanked.Kirsty groaned and I blinked, what was she thinking?I. I loosened my pajamas. Then, while we were dancing, I let my PJs fall to the floor. I had nothing on underneath. My sister’s mouth opened big and then she smiled and giggled. I pulled my PJs back up slowly. “Why don’t you have on any underwear?” “I never wear any to bed.” “Really? Why not?” “It’s more comfortable. Pajamas are enough for me.” She seemed to think about it, and that was that. I felt a little embarrassed, but I was also glad I had smoothly teased her with a look at my cock. I was.