Has anyone besides me masturbated with their sisters Panties?

Jacking off another guy one and only time
This was a long time ago I was just a kid and my friend was about 2yrs older than me. We were having a sleep over and talking about girls at school. We were both lying in our underwear and were both hard. We talked for a while and I told him I had some of my sister’s underwear. He said “let me see”. I handed him a pair of her panties and he smelled the crotch and told me how good her pussy smelled. I was also sniffing a pair. I pulled my underwear down so I had better access to my hard on. We were both lying there sniffing my sister’s panty. I reached over and wrapped the pair that I had around his hard cock. He gave out a sigh and I kept on going. He was still sniffing my sister’s panty and saying how he wished she was jacking him. I moved the panty from his hard on and put his cock in my mouth. I had never cum before but I could taste something on his cock and was sure it was precum. I sucked him for a while then he told me I better quite or he was going to shoot in my mouth. I had never seen cum or watched anyone cum. He quit sniffing the panty and we just laid there and talked about sex. After a little bit he picked the panty back up and started sniffing again. He had his legs spread and I rolled over between them and started jacking him again. His breathing was funny and he was squiring around. He told me to stop or he was going to cum. I told him to cum for my sister’s panty. He was super hard. I felt his body tense and he said let me shoot in her panty. I quickly wrapped the panty around his cock and felt him start to shoot. His hot cum felt so good on my hand and on that panty. When he was done shooting I took the panty and wrapped it around my cock it felt so good soaked in cum. That was the only time I have been with a guy when he came and it was so hot even to think about it now. It was 6 months after that before I started cumming , but it was in my sisters panty. And to this day I still like to cum in panties.