Catching my older sister Barbara fucking my dog and blackmailing her into having sex with me

My sister likes getting fucked by me and the dog

In the early 1970s I was 12 years old (m)and my oldest sister Barbara was 17 years old. She had huge tits which she would later have a breast reduction down to 36 c tall with a nice ass slim waist and a very hairy pussy like all the girls at that time.
It was early summer and a Saturday morning. I played little league baseball, but the coach was sick so practice was canceled.
I decided to go home, instead of hanging out and playing a pickup game. My sister Barbara had the basement bedroom which had a small window which I had adjusted the curtains so that I could spy on her.
I had seen her naked several times and a couple of weeks ago I saw her fucking her boyfriend. My parents had a Polaroid camera and I had bought some film and flash bulbs for it.
When I got home my parents had gone shopping with my little sister and had dropped me off at the ballpark when they left.
When I went to open the door it was locked I used my key to open it. I could hear music coming from the basement. I went and got the camera from my parents room and the film from mine. I went outside and looked through my sister’s window and couldn’t believe what I saw. My sister was lying on her bed naked with her legs over the edge her butt scooted up to the edge with her legs spread holding onto my dog’s head as he licked her pussy. Rascal was a large male German shepherd over 100 pounds.
I tore open the film package fumbling to get it loaded in the camera. When I looked back at my sister rascal had his front paws on the bed humping away as Barbara reached down and guided his cock into her pussy.he was jackhammering away as Barbara wrapped her legs around him and arms around his neck. I got a picture of that. Another one of her seeing the flash and looking up at me. Another of her pushing rascal off her. And another of her covering her self up as rascal stood by the bed with his red 8 inch cock hanging down.
I ran back into the house hiding the developing pictures along the way. When I got to Barbara’s room. Naturally she wanted the pictures,she opened the door wrapped in a sheet with rascal licking his cock in the corner. Yelling and threatening quickly turned in to begging and pleading
Anything I wanted she said. Too which I said anything with such a Leer in my voice that she just nodded her head in understanding. I started to take my clothes off and when my 7 inch cock stuck straight out she looked surprised. I pulled the sheet off her and told her to get back on the bed. She laid back I spread her legs as I crawled up between. I rubbed my throbbing cock between her pussy lips after a few thrusts I was balls deep I couldn’t hold it any longer and shot my cum in her pussy .she looked up and said you came in me didn’t you. After my cock went soft and I pulled out of her I said ,I’m going to cum in your pussy every day .rascal came over sniffing but she pushed him away. No don’t I said let him finish. It didn’t take much encouragement for rascal to be licking up my cum as it oozed out of my sister’s cunt. It didn’t take very long before he was pounding away as Barbara was moaning.after a few minutes he stopped humping and had knotted with her. I took the rest of the pictures and got up on the bed with my stiffening cock petting rascal and telling him that he was a good dog I grabbed her by the hair and was face fucking her she gagged as I pushed as deep in her mouth as could Cumming down the back of her throat.
We fucked every day the rest of that summer until she went to college and still did whenever she came home on break
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