Growing up I went back and forth from household to household. I spent my summers with my stepmom and half sister. My step mom is absolutely beautiful. Petite, tan, dirty blonde hair, blue eyes and a large chest. My half sister is about 5'8, beautiful hazel eyes, long dark hair, tan skin, she was gifted with a tiny waist but a massive beautiful ass and rack. My step mom and half sister and I were always very close growing up. We always live out in the country on a farm. We grew up working our asses off, but we're rewarded with freedom and beautiful nature. Many of hot summer days after working the farm my sister and I would walk to the lake at the edge of the property and would naturally end up skinny dipping. My sister is 2 years older than me and growing up we were always interested in each other's bodies but we were to young to know anything about anything. There was a few occasions though where things almost got strange. Skinny dipping obviously. One summer we were having to fix the roof on one side of the house so my sister and I shared a bed most of the summer. I would get late night erections and my sister would rub her ass up and down on it, making me precum. Another time after coming back from the lake, my sister in her Bikini, I was stripping down to shower and had gotten down to my boxers when we got in a ruffle over something, she ended up on top and my erection popped out the front of my boxers and pressed in the center of her pussy lips, we both paused... her faces changed to a subtle smirk and she began to rock on my erection. This point everything changed. She became very wet and excited and pulled her bikini bottom to the side to where my dick rubbed her wet lips and clit. She held my wrists down and rocked hard furiously. Then before I knew it, she was slowly and carefully taking me into to her. That day we both lost our virginity together. She maimed loudly as her tight pussy was spread wide by my thick cock. My sister rode me till she finished and I happened to let off inside her shortly after.
After this my sister and I have always been much closer. We didn't do anything of thy nature again that summer. The following summer, my sister spent most of it visiting her absent father so it was my stepmom and I on our own, u fortunately that meant more work for the both of us. About a week in, I was showering before bed and I guess I was taking too long well my step mom walked in to "check on" me and busted me jerking my meat. Super awkward, my step mother stuttered through her words and blushed and left. The following evening after showers my step mom was acting weird. She wore different clothing, more revealing/sexy clothes. She sat me down in the living room and brought me a glass of wine (a normal thing my s.mom did for my sister and I) and we started talking. Tonight was different though. She moved in significantly closer and was more hands on. Then she brought it up. She apologized for interrupting me while i was jerking. She complemented my tool. Then told me she knew what happened with me and my sister last summer. Told me I was nothing to be ashamed of, that she wasn't really my half sister but my step sister. She also mentioned that she understood why after having seen me naked with cock in hand the night before. She placed her hand on my cock as she leaned over and revealed a lot of her cleavage. It was a weird moment but I knew I couldn't stop the erection I was getting. She could feel it too, she was slowly rubbing it as it got harder. She mentioned that she would make up for ruining my off the night before and if I am going to use it with my sister I ought to know what I'm doing. My s.mom pulled her too down allowing me to feel her amazing chest. She kissed me, and soon there after I was mounted on top, driving long hard strokes into her. Over the next week my step mom and I fucked like wild rabbits. Not once did I pull out. She made sure to tell me, when I have sex with my sister I HABE to pull out. My sister returned towards the end of the summer. Mom and I cooled off the sex. It didn't take long before my sister and I were getting hands on with each other. The last week I was there that summer, my mother walked in on us during lunch time having sex in the living room. We were both scared we might be in trouble. Mom smiled and started taking of her clothing. It was a beautiful sight to see my beautiful mother and gorgeous sister naked in front of me. Mom jumped in, giving us both tips. That day, our work was forgotten about. We three had lots of dirty kinky sex.
The following summer, followed practically the same suit, w my step mother, step sister and I worked the farm through out the day and then fucked the night away. Only difference this summer, my sister was pregnant before the summer started. She was just beginning to show when I got there. That being said, I didn't pull out once! After that summer I didn't see them for a few years. Actually didn't see them again until my sister and I were both adults. After a multi year hiatus, I recently reconnected with my step mom and sister. My mom and I aren't into it anymore. My sister developed beautifully. Our sex life has taken off even wilder than before. Her and I are both bisexual. Other than the kinky and freaky sex that we have, we've begun to bring at her people into it. Sometimes it's a guy friend that I end up double penetrating her with. Sometimes it's a lady friend of her that we both pleasure.

Thank you for reading, it's good to finally talk about it. Anyone else partake in anything i****t? Or similar to this situation?