She was wearing what can only be described as a long tee-shirt now. I couldn’t help noticing her nipples through the thin cotton material. And it wa... short. Very short. God she had lovely legs. ‘White with one sugar right? Like you do after dinner at the restaurant?’ I nodded and said ‘Yes, that’s great. Thank you.’ She took her coffee and sat at the other end of the couch. She swung her legs up onto the couch itself so that her feet were almost touching me. ‘You don’t mind do you?’ she asked. I wanted to get naked again. All three of the girls had put shirts on, but were bare bottomed, so I caught a glimpse of bare ass and pussy whenever I could.Steph and I made an exception to our rule and had a second glass of wine, actually all four of us did. While we were drinking it, the girls were talking about fisting and how much that they like it. Steph's only complaint was that I couldn't get my fist into her but she loved it now that she had it done again. Lexie asked if she wanted to. I wasn't quite sure if she was thinking that we were going to do what I thought we were going to do until she finally whispered in my ear: "Are you gonna fuck me or not, big boy?"I needed no further encouragement, I climbed up onto my sister, and though I had never had actual sex before, I had seen enough pornos."Woah, slow down, guy" she said, laughing, obviously noting my inexperience and horniness. She took hold of my cock and positioned it right at the entrance to her pussy. "Now,. Continuing his line of lying banter he answered, “Yes, they know that’s a sign that there’s going to be some fun play in store, I’m sure he will slide out for you. Jax will hold his halter and keep him in place to keep him from trying to move away.”Robin moved her hand over the warm sheath and gave it an uncertain stroke. This was by far the weirdest thing she had ever done, and the fact that she was naked, kneeling in the dirt and stroking a mule’s flaccid shaft made her feel decidedly odd..