jacked off tonight while looking at a picture of my older sister nancy, while I talked to her on the phone.
Seeing your post reminds me of when I was a young teen (maybe 14) and was just leaving the bathroom having taken a shower. I had a towel around my waist and my sister, two years younger, stopped me with a question. I have no recollection what she asked, but I remember the conversation evolved into some playful sibling wrestling. I started to get turned on by the whole thing and remember at one point holding my sister's hands down and lowering my cock onto her outstretched hand. She let it lie there for a moment and then closed her hand around my cock and just held it for a few moments. The wrestling continued with a few more brushes against my cock. When we came up for air and she stepped away, we were both breathing really hard. I was seated on the end of her bed and she was standing against the wall. She was looking at me and said, your towel is opened. I looked down and saw that the towel was almost off, giving her an almost full frontal of me. My cock was at full attention and I just looked up at her, shrugged my shoulders and smiled, leaving the towel just as it was. She kept her gaze on my cock for what seemed like forever and then I stood up, removed the towel and walked naked from her room saying, thanks that was really fun.
I hadn't thought of that for a long time until reading your post. I've not spoken to her of it ever, but now 40 years later, I think I'll ask her if she remembers next time we speak.