The bottom of her ass cheecks showed. When she got on her bike, she leaned over several times "to adjust" her socks. She noticed my bulge in my bike...shorts and just chuckled and said "Things haven't changed that much"!We packed some snacks an had lunch in the field. We sat on some warm rocks and made small talk. She said she was looking forward to college and being able to fuck guys with no parent around. I was extremly horny by now.I told her I had to piss and walked behind a tree. I did. We arrived back home,and after my wife and sister had finished putting the world to rights,we were sitting having dinner.The meal was fantastic,and the wine was flowing,the two of them chatted away,i seemed to be left alone,only brought in on conversation when needed.The worse of this was the fact that her sister kept putting her hand under the table,and squeezing my crotch,and my wife was doing the same on other times.Soon we were in the lounge,the sisters abit drunk,the conversation was. She popped the key into the back of the lock and turned it, she turned to face him and flipped the lights off. Pitch blackness for a moment. Silence except for movement coming from near the door close to him. He stood up and began to speak 'what...' but she came close to him, putting a hand on the small of his back and putting a finger to his lips. 'shhh' she said 'keep going as you were' she whispered softly. His eyes slowly acclimatising to the darkness he could see her in front of him turned. I relished in the excitement of them growing hard. By the time they touched the glass, my eyes were closed and I was panting. My breath condensed as soon as it hit the window. I pushed my nipples against the glass and felt them freeze instantly. They were hard as nails as I brushed them over the window. I wanted every part of me to feel like this; cold and excited.I looked down at the men through dreamy eyes. I could see them cheering me on, encouraging me. The man with the dog had his hand.