Growing up in rural Montana, with the closest neighbors being 11 miles away can be rough on a young boy. Luckily I had a twin sister who was a bit of a tomboy, and always up for a fishing trip or campout. Sis loves fishing to this day, takes her family camping and is still as much of a tomboy as ever. Don’t get me wrong, Sis was and is to this day a looker, and did enjoy some girl activities such as cheerleading, barrel racing and baking contests, which were fairly common in our area. We were close, and I was very protective of her, punching more than one boy in the nose for teasing her.

 As we were growing up, our mother left Papa and moved to Utah, taking my sister with her at the age of 14. Sis would come and stay with us every summer for two months, and we always had a blast. She never wanted to go back home, her step dad was VERY religious and didn’t allow her much freedom.

 One of our favorite activities as children was wrestling, but as we got older I would have to take it easy one her, as she was a small girl. These wrestling matches were innocent, but when Sis came for summer the year we turned 18, some things had begun to change. My tomboy sister had developed a young ladies body, and still wore her cut off jeans and tank tops, as she did in previous years. We were 18, I was 18 and there just weren’t any girls around our ranch during those summer months. I always felt guilty, but I couldn’t help sneaking a peak at her ass as she walked away from me, or her small boobs when she bent down for whatever reason. Yes I know, it’s my sister, but I was a horny 18 year old boy, and just couldn’t help myself.

 I did my best to not think of my twin sister in sexual ways, but she had a daily habit of lying in the sun, wearing nothing but a string bikini. It was hell sometimes.

Around the end of her first month with us that summer, Sis jumped on my back as I was walking to the barn, just like she had always done in years past to get one of those wrestling matches started. We rolled and grabbed for a few minutes on the ground, and I told her I needed to finish my work before Papa got home, so it ended, with me walking off to the barn...with a hard on. I had to relieve myself, feeling those tanned legs wrapping around me and those firm breasts pressed against my back had excited me more than I could imagine. As soon as I made it to the barn, I shut the doors and began jerking my rock hard cock. I felt so bad, but I couldn’t help peaking through a window while stroked myself, watching Sis prepare herself to work on her sun tan. I came quickly, put my dick away, and went about my business for the rest of the day, all the while feeling so guilty.