Here is the story of how I made my brother-in-law cum. I'm not proud of this, but I'm glad I did it. My step sister is 8 years older than me. Her new husband at the time was 25 I was 16 when this happened. I am now 29. He is such a hottie. I had over heard my sister talking to her friend when she was just dating Jason, that he had a large cock. I can say, I don't know how big it is, but it is by far the biggest I've seen to this day. So here is the story. I was always hot for that stud. There were many times when you could cut the sexual tension with a knife! We were in our pool, all of us. My sister, Jason, my friend, my mom and dad. I was always poking at Jason, groping him, and jumping on his back. I liked to flash him when nobody could see. I would pop a tit out of my bikini and then jump up and straddle him. He would always take a good look before saying something. I would act all embarrassed. Well one time I wanted to turn up the heat more, so I pulled my bottoms to the side and exposed my shaved little pussy. I jumped and wrapped my legs around him from the front. He was crouched in the shallow end. When he stood up, I leaned back, my pussy was looking right at him. He took a good look. Then he didn't say anything. He turned us away from anyones view. Then he talked to me like nothing was up but kept looking at my bare pussy. I was getting so hot. I could feel his cock growing too! Right then my mom called me and asked if I could get the floating chsir for her. I got out of the pool, and fixed my bikini while I walked by Jason. When I got back in the pool, my sister and Jason were kissing and giggling. I was jealous. I splashed them for fun (but really to break them apart). They chased me around splashing me. Then Jason grabbed me from behind, and my sister splashed me like crazy. While this happened, I slipped my hand down his trunks and grabbed is soft cock. My sister went to grab a drink. Jason was quietly asking what I thought I was doing. I stroked his cock. He was telling me to stop and trying to get my hand out of his shorts. All I said was "don't make a scene or everyone in the pool will know". He was stuck. I stroked him fast. He got so hard! It was huge! Like no kidding, I was thinking at the time, 'this has to be as long as my ruler'! I don't think it was actually 12" long, but it was large and very thick. So here I am standing infront of Jason, my hand behind me down his trunks. I grabbed his left hand and put it on my ass. He grabbed it and groped me. He slipped his hand under my bottoms and fingered my holes. He had one finger in my pussy and one up my ass. I was close to cumming myself when I felt a hot splash on my back. Then another and another. He was cumming on my back, in my pool, with my family right there. He stopped what he was doing and I tucked him away and dove in to clean myself off. Over the next while I would text him to 'cum over for a swim'. Or ask if he 'needs a hand' with anything when he is over. We teased each other many times. But nothing else ever happened. I just remember it so well though. Its probably because I fingered myself to those thoughts so many times. I can almost feel that big cock in my hand, it pulsing, my back getting sprayed with his hot cum. Oh god! I wish I would have bent over and let him fuck me with it.