My first time with little sister

So first off this took place when I was 19 and my sis was 18. She is skinny small tit's and needy. And upto this point I had seen her pussy on a few occasions and it was hairy but well trimmed. So one day we had to visit our grandparents and I had just gotten my license so I offered to drive me and her. It's an hour and a half drive. I was wearing basket ball shorts and I had by this time developed an almost obsession with her I wanted her so bad and I inevitably got hard on the drive and it was so noticeable. She kept glancing at the tent in my shorts and eventually asked me if she could see my dick and that she had never seen one before in person and I obviously daid yes and pulled it out I was already leaking cum. I told her she could touch it if she wanted and she grabbed it and slowly stroked my rock hard cock. Im not even embarrassed to say I almost instantly came and it shot almost up to the ceiling or the car. I pulled over on a back road to clean up and asked her if I could see her she shyly said yes and pulled down her little tight shorts to reveal a nice little bush. I asked her if she could spread her legs open so I could get a better look and she did. I asked her if she liked to masterbate. She told me she fingered herself everyday. It turned out we both had a pretty strong masterbation rabbit and as we spoke about it I told her that I have came to her 100s of times in my head and she started to rub herself as we spoke. She was so wet that I could hear it. I asked her if I could touch it and she nodded and I reached over and started to finger her pussy. We then both leaned in and kissed and this set us both off. After that first kiss we were going at each other like animals. Feeling each other all over and sticking our tongues sloppily in to each other's mouths. I lifted her shirt and she undid her bra and climbed on top of me and told me she wanted me to take her virginity which was like a dream come true. She was already so wet I slid right in. It was really awkward in the front so we climbed in the back and she bent over and I fucked her from behind and while I was holding her ass open my thumb slipped in her but hole and she moaned and said keep it there. Neither of us lasted long and I came inside her which seemed to set her off because she came right after me. This was the start ofa long relationship and so.e of the best sex. It's so much better with her for some reason.