Last weekend we were at the cabin with my wife’s sister and her husband. Both couples have been married for over 20 years and know each other well.
The weather was cold, but we still went on a long trip. We returned to the lodge in the late afternoon. there we all took a hot delicious shower before sitting in front of the fireplace and enjoying a glass of wine or two in our bathrobes.
We were all tired and my wife and brother-in-law went to bed while we sat in each of our chairs in front of the fireplace and talked. My sister-in-law curled up in the chair and I noticed that her bathrobe slipped a little to the side. I tried not to look, but my eyes were constantly searching for the bare area. I did not see anything, but I noticed that she was not wearing any underwear.
We kept talking like nothing, but just the thought of her sitting there without underwear made me semi hard. I do not know if she saw my semi-hard cock or if she saw me staring at her, but almost imperceptibly I got to see more and more of her. Still without saying what happened.