Catching my little sister fucking my dog

It was mid September and because of our rotating class schedule every Thursday I had two study halls at the end of the day. Which allowed me to leave school at just after 1 o’clock. Our house was only about a ten minute walk from the school. I was 15 at the time and still a virgin
When I got to the house I realized I forgotten my house key that morning. Which wasn’t too much of a problem. Because I always left my window unlocked for just such an occasion. All I had to do was climb up on to the porch roof that ran the length of the house to get to my window.
When I got on the roof I saw the curtains from my 13 year old sister fluttering in the breeze, as I got closer I could hear some boy band playing softly.
I hadn’t seen my sister all day at school, which wasn’t all that unusual as we had a large high school. I then remembered her whining to our mother about being sick that morning as I was going out the door. I decided to sneak up and see how sick she really was.
When I peered around the corner of the window I couldn’t believe what I saw. There laying on the bed naked was my sister which wasn’t all that amazing. We shared a bathroom and I had seen her in many stages of undress.
The amazing thing was there between her legs lapping away at her pussy was my dog sarge a large German Sheppard.
I knew no one would ever believe me so I took out my phone and started to video tape it. I only got about minute or so of this before she sat up and pulled sarges head up. He licked her face and held up his paw as if to shake, to which my sister produced one of the two small towels taped up with duct tape, that she kept at the top of her bed. Ostensibly to keep stuff from falling behind the bed. I would now find out there real purpose as she slipped it over one paw and then the other.sarge stood there looking somewhat comical with the towels on his front legs and his pink pecker sticking out several inches. At which point my sister got up on her knees and spun around. Before she got her hands on the bed sarge jumped on her and started humping and stabbing around. My sister reached around and guided him into her pussy. He started pumping her like a jackhammer, I could hear her moaning like a bitch in heat.he kept this up for several minutes before slowing down and panting as my sister had a hold of his front paws with her head in a pillow on the bed.
At this point I climbed through the window and got a picture of my sister looking like a deer caught in the head lights. All I could think to say was wait til every one sees this. My sister seeing the phone in my hands turned her head down and said please don’t tell anyone I’ll do anything you want. I said anything with such a Leer in my voice that she just nodded her head.
I told her to let the dog go because I’m next as I took my clothes off. She said I can’t he’s stuck. I looked more closely at sarges cock buried in my sister’s pussy, every couple of seconds his balls would constrict upwards and his tail would twitch as he pumped her full of his doggy cum.
I asked how long is that going take. At least another 15 or 20 minutes she said.
I said thats okay you can suck my dick first as I got on the bed on my knees. When she saw my 9 inch dick her eyes bugged out a little. She opened her mouth and started taking my dick in a couple of inches, I grabbed her by her hair and face fucked her for a couple of minutes and came down her throat as she tried to get away. She gagged some and licked her lips and said that doesn’t taste as bad as Cindy said. I asked her who Cindy had sucked off. To which she said never mind. I sat there on the bed sarge was getting anxious and my sister let go of his paws and he pulled out of her. My sister got up and started to get her clothes when I told her were not done yet she looked at my hardening dick and I asked her how she wanted me to fuck her. She dropped the clothes and laid back on the bed. I crawled up between her legs and as I pushed the head of my dick into her pussy she told me not to come in her. I easily sank all the way into her with all of sarges come lubricating the way. As I started fucking her faster and harder it wasn’t long before she was moaning and twitching as she came. I told her I was going to come soon but she grabbed a hold of me by my ass cheeks and said hold him there as she came again. It sent me over the edge and I came deep inside her. We lay together for a minute before I pulled out. She looked at me and said you came in me didn’t you. I told her you wouldn’t let me go. I know she said.
We continued to fuck every chance we got till we went to college and still do on holidays

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