I am the youngest of 3 siblings my brother, my sister and I. My first time was during the summer of '14 on a very hot day. My parents were working and my brother was away at football camp so my sister was in charge of me for that day. Not that she took care of me as she was always on her cell talking with her friends. I remember she was mad at me because she had to babysit me and she couldn't go out with her friends.
It was a hot sunny day so we were out in the pool, my sister was sun tanning her self and i was swimming trying to make her come in so that we could play in the water. Me being the annoying little brother kept nagging her while she was on her cellphone. I was looking at her to annoy her and she turned on her stomach to tan her back when I noticed that her bikini bottom somehow shifted and i could see half of her pussy. Being the teenager i was i imminently got hard. Every once in a while she turned her head back to make sure i was ok. About the third time she turned back she yelled 'stop looking at me perv'. She then turned around on her back and now her bikini bottom slide up her pussy and i saw a little bit of her pussy. She then noticed what i was looking and she got really mad. She hung up and came to the edge of the pool fixing her bikini bottom telling me to get out or she would tell mom. I still had my hard on at this point so I i couldn't get out of the water with out her noticing. She once again said to get out, now she was really mad, so I did. The moment i got out she imminently noticed my hard on, to which she said 'Oh my god, why are you hard?'. Not knowing what to say, I just told her that while she was lying down I could see the side of her pussy. She said that's what got you hard, haven't you seen a pussy before. I said 'yea', but she said 'not in mags or porn, but in real life' to which of course. She clearly caught my lie and accused me of being a lier. She asked me if I wanted to see one in real life, stunned I said yes. Ok' follow me. I followed my sister to our den. Down in the den she said she will show me her pussy but not to tell mom or dad. I agreed and she grabbed her bikini bottom and pulled it down to her thighs. Wow, it was the most amazing thing I have ever seen. She said 'ok look', she had a small patch of hair like a landing strip and all the rest was shaven clean. her pussy seemed small but had her inner lips coming out. Having had a good look, I asked her if i could see inside to which she said 'your turn now'. I said 'what'? Yea, I showed you my pussy now it's your turn to show me you dick, she exclaimed. A little hesitant I began to pull down my bathing suit until it feel on the floor around my ankles. She said 'wow, nice' . I couldn't believe it, there i was naked with a hard on looking at my sisters pussy. She then said pull it back. I was a bit confused, and she said your foreskin pull it back. I grabbed my cock with my hand and pulled back all of my foreskin until the head of my cock was in full view. To this she said ok, I'll show you inside. She pushed down her bikini bottom to the floor and put one leg on the sofa and with her fingers, she spread open her pussy, i remember she had a bit of problem because her inner pussy lips were stuck together, but once she spread them apart it was amazing to see all that pink meat in her. She asked me if i liked what i saw. yes, I said. She then gave me a sex ed class saying this is my clit while rubbing it, these are my outer labia and these are my inner labia while pulling on them, which were quite long. I then put my hand forward wanting to touch it but she stopped me. she grabbed my hand and she put it against her pussy. This was even better that just looking at it. I guess i was a bit nervous and naive because i only wanted to put a finger in her pussy. I told her that this was the most amazing feeling i have ever felt. She laughed a bit and said you think this is amazing, and she grabbed my dick and started to stroke it. I couldn't believe this was happening i was fingering her pussy and she was stroking my dick. I could feel her getting slimy and me getting precum. She noticed it and asked me if i wanted to touch my dick with her pussy. (Now i am not naive and have seen porn) So with out wasting time i got really close to her and guided my dick to her pussy. She was rubbing my dick in her pussy lips which now was really wet and slimy. While she was playing with my dick and her pussy, i decided that this was the time to see her breasts. I put my hands on her breasts and uncovered them from her bikini top. They were really nice, not very big as a matter of fact they were quite small, but still tits are tits right? While touching my sisters breasts and her nipples she let out a small moan. She was know really rubbing her pussy hard with my dick and getting really wet. I tried a couple of times to push forward and put it in her cause i really wanted to feel what it was like, but she stop it before going in. I could only feel the head of my dick going inside, but wanted more. She then suddenly stopped and just rubbed my dick on her pussy slowly, she moaned and her pussy started to squirt. Oh my god, a big gush of water came out of her pussy drenching my dick and balls. She grabbed on to my neck as she looked like she was going to fall still squirting tons of what i know now girl cum. She then sat on the couch breathing heavily. Not sure of what actually happened, i asked her if i could put my dick in her pussy. She said you want to cum, and i said yea. She laid on the sofa removed her bikini top and said 'ok, come here', She spread her legs and i got between them. She grabbed my dick and guided it to her pussy. I started to push my dick in her pussy and it was quite easy because she was quite wet still. Once i felt my dick head go in, i pushed my whole dick in her and it was amazing feeling the warmth of her pussy on my dick. I was so good that i just left it in there having a million feeling and thoughts. I must have been in her with out moving for a minute or so until she slapped my head saying 'are you going to move? - fuck me!' . With that i started to pump my dick in and out of her pussy. I started to get into this and pumping her fast, when she said 'Slowly - enjoy it'. She extended her arms as to hug me, so i extended my arms to grab her hands, and she giggled and said ' no stupid- come here'. I leaned forward still with my dick in her pussy and she hugged me while laying on top of her. That felt really nice and i liked feeling her body against mine. See she said, feels good right? She wrapped her legs around me and said ' you can also suck my nipples '. I started sucking her nipples and enjoyed every bit of her tits. I told her i was going to cum, and she told me not to cum in her pussy and cum on it rather that in it. Not being able to control my self while taking it out of her pussy i started to cum on her still wide open pussy. She grabbed my dick and rubbed all of my cum on her pussy and my dick. She asked me if it felt good, and i just collapsed on top of her. She said it was time to clean up, so we got up put on our bathing suits and went to the pool shower. Before going back to our business me in the pool and her on her phone. She said, ' You know? you are a really good at sex, we might have to try it again'

That summer, me and my sitter were like rabbits and every occasion we were alone we worked on improving my stamina.