I am 16years old fit guy , while my bestfriends sister is 17. She is like 160cm latina type , pretty thick with big ass and very fit (10/10). She is the best girl in the school and everyone admires and wants her . Also , she doesn’t had any relationship with noone as john told me .Me and her relationship have been really close . One day of summer my bestfriend parents left town for a couple of days and my bestfriend John invited me for a sleepover at his house . I got there we spoke , played ps4 had fun , had a chat , until John received a phonecall from his mother that he must pick up his cousin from her house , to drop her to elsewhere . I found an excuse not to go by saying my leg hurts and John will be gone for 2-3 hours(his cousin lives on the outskirts of the town and needs a lot of time to get there ). He didnt think much of it and left . Almost instantly , I went into his sisters room and start a chat(we both were on the bed) . She was talking to me about her problems and I made it seem like i understand her .After almost 20 minutes of chat , she saw my bonner and started acting strange . I could tell she wanted it but she couldn’t . In my mind I was thinking that i will not let this huge chance go away , and even if she didnt want i would r@pe her . At some point I made a move to kiss her and thank god she kissed me back . We were kissing and i was touching her ass , thighs and boobs aggressively for like 10 minutes until i lifted her shirt up and surprisingly she had no bra on . She understood and lifted my shirt up revealing my abs , which she touched and kissed so many times . After that , I pulled down my shorts and she pulled her pijamas . I couldn’t believe this was happening, as i had a crush on her for so many years . With her being only with a string , I removed it , hold her legs near her head and started fucking her virgin pussy for the first time.(My size is 19cm and I am also a virgin).I go crazy and make her scream , after a while i fuck her in doggy style and after a lot of orgasms and leg shaking , I nutt inside her . At that moment i felt something warm like burning my dick . We both sat on the bed and relax . Later , we both had a shower together. I was touching her thighs , stomach, ass , boobs , kissing her as she was exhausted . After the bath was done and we both dryed , she went on to put a Nike pro , a tight bra and wanted me to hug her from behind , in order for her to post a story on Instagram close friends .We continued the cuddle for hours and I was extremely proud and hard of what i have done . I was literally touching her thighs and they were bigger than my head. I said “you are so perfect” while i put my hands on her ass, and had a taste of that cake .Her ass was super thick and had an undescribable taste . She replied with “you are too”and started touching my cock , under my shorts. We finished and decided to keep this a secret at all costs , and also agreed to do this again sometime .John came back and didnt realise nothing so everything went on and we continued our lives normally. Im planning to record me fucking her , inorder to nut in home . Also , to proof that im not lying .