I got a boner looking at my older sisters breasts in her tiny bikini. We are family so we typically are comfortable around each other. She moved past me and felt it rub her thigh. She tuned to me and started touching it. She said it’s ok and she wanted to know how it works for when she gets a boy friend! I was frozen and she pulled it out and stroked it! It felt so good I started touching her smooth skin under the water. I came in the hot tub while she kept touching it! She looked at me and said we may as well learn about it. The next day we were watching a movie with an intimate sex scene. She was only wearing a long t shirt. She spread her legs so I could see her pussy and bit her finger while she watched. I tried not to look but did and she saw me look! She pushed her feet against me and started rubbing my dick and she felt I was getting hard. She is older so I never questioned it as she was older and wiser. She looked at me and said I want to know what it’s like and you should have experience for your next gf! Pretend I’m your crush! So I did! I kissed up her legs and ate her out and she coached me where to lick and finger! The smell and taste was new and I was timid but she came as I licked her! She told me to try putting it in so she knew what it was like. I eased into her and she was so tight! As I pushed it deep I came instantly inside her! It felt so good. I leaned forward and kissed her. It was weird but it felt so intimate I had to! I pulled out and she said it’s ok I started birth control! She could tell I was as confused and told me it was ok we were learning and experimenting! We started watching adult content together and she wanted to learn how to give a bj! She slowly sucked on me and I came in her mouth and she was surprised and a bit grossed out but she swallowed it! We didn’t take it further until a year later she had a break up. I had grown sexually and she had too. She came in my bed one night and said just pretend it’s someone else as she put her hand down my boxers. I fucked her as hard as I could doggy style and we got dirty. I ate her and licked her ass. I was pretending she was a girl from school but I could also see it was my sister. I came on her ass and back! She is married now and I’m dating and we didn’t do much for years but she came over to borrow my rug cleaner last a while back and we talked about it. We shared about our current sex lives and then she said I don’t regret what we did then! We stare at each other do a second and the we did it again! We both had needs our partners couldn’t supply. It’s too late to stop I think we will always be like this now!