Two days ago my parents went on vacation for a week to the Caribbean. Being a rather responsible teenager, they left me in charge of my twelve-year-old sister Jamie (name is changed). We live in upstate New York on a large piece of property which consists of mostly wooded areas. Though no one in my family hunts, there is a small hunters cabin located in the woods which we use as a warm up location for snowmobiling.
Yesterday Jamie and I decided to hike to the cabin and packed some snacks and soda to eat in the cabin. The goal was just to hang out have fun and do a bit of 'brother sister' bonding. I took along a blanket so we could lie down together, until this point we never had any sexual relations. When we got to the cabin Jamie had tripped in a muddy hole along the side of the trail and was rather drenched. She stripped off her clothes (minus her bra and panties) because the cabin is heated and she could lay her clothes out to dry.
I invited her over to the pull out couch which we pulled out so she could get warm with me under the covers. I noticed a bit of pubic hair around the outline of her panties and teased her about it for a few minutes. She told me to shut up and said that I probably had more than her anyway. Since I trimmed that morning I took her up on that semi-bet and showed her my penis which was rather barren of pubic hair. We lay there for a while wasting time when she whispered in my ear that she was wet, and when I lifted up the covers she was no longer wearing panties.
Indeed she was so wet there was a wet spot on the covers where she had been lying. I immediately reached down and began fondling her pussy. It was as if someone had poured hot water all over it, she was soaked. I gently slid my fingers into her slit and up inside her. Within moments she was gasping and telling me to stop. I ignored her and a minute later she came, pouring hot juices all over my hand and moaning louder than I have ever heard someone moan before. After lying for another few minutes she reached down without warning and wrapped her hand around my already throbbing cock. Less than a minute later I was shooting ropes of cum all over her a-cup boobs and cute tummy. We had lots of fun after that but that's more or less the highlight of my week off with Jamie.