Accidentally came in my pants
This happened years ago when I was 19. I had to watch my 2 nieces for about an hour when my sister ran out shopping. I was sitting in a big plush chair with a seperate cushioned foot stool. The girls came giggling into the room both wearing flimsy little linen skirts that they had obviously grown out of. I told them to sit and watch some stupid show that there mom had planned for them. They immediately jumped up onto the cushioned foot stool in front of me and fought over who gets to sit there. That's when I caught the first glimpse of there panties. One had on pink the other light blue and they would flash me as they play fight on the stool. I'm kinda perverted so the site of this made the blood rush to my p****. As They settled down and both layed across the stool with there little butts pointing at me I noticed that all that play had wedged there panties deep into there little butt cracks. They would take turns on there belly play falling over the edge of the cushioned stool, as I would steal peeks of there panties pulling to the side showing there little p**** or b******* sometimes. The oldest one reached down around her plump butt and pulled her panties way out and I could see all of her for just a second. She kept pulling at them then to my surprise she pulled them down to her ankels then walked on her knees as she pulled them completely off. My c*** jumped in my pants and I could feel an intense heat building up in my groin. She took the panties and pushed them under the cushion and layed back down on her belly on the stool exposing her b******* and p**** to me. She began to rock back and forth on the corner of the cushion and I could tell she was getting off. Each time she pushed forward I could see her little slit crunch up then she'd push back and pull it tight. I couldn't stand it anymore as my c*** was dripping precum into my undies. She let out a little noise then rolled over on her back and pulled her legs up to her chest and reached down and started furiously masturbaring herself with her hand, her butt placed precariously on the edge of the cushion. I instantly shot huge jets of c** into my pants as I tried to ignore what my niece was doing. After about a minute I said I gotta think of how to deal with this situation. I said okay that's enough girls, let's get changed to go outside and play. They both shot up and ran into there room to get changed. I remembered the panties she stuffed in the cushion so I reached in and grabbed them. I stuffed them in my pocket and I still have them to this day. I didnt know at the time but stuff like this doesn't happen often.