My first time with my girlfriend's friend

Hello how are you this is my first story I hope you like it. Everything started when I was 17 years old I was a normal guy and the truth never had a girlfriend or anything I don't consider myself ugly or handsome but anyway. At that age I wanted to hook up with a girl named Daniela we would send each other messages and go out everything was going well until one day we went out with her friends where I met Lili (Lili is a girl of medium height white skin green eyes slightly chubby long hair) at the end of the night she asked me if I liked Dany I got nervous in that moment and told her yes she smiled and said good luck that day she sent me a Facebook message later when I was dating Dany she would ask how things were going - hi how did you go with Dany - well fine I think - yeah we saw each other the other day they were eating - jeje if you have to take advantage of it - and already did it with her - no like you think maybe but don't know how to start - haha so tell her for sure she wants the same always had conversations and told me that neither she nor Dany were virgins the truth I felt like she was confiding in me and telling me about everything including sex and their experiences time later we went out with friends already in the evening Dani's dad took her to his house and I got to accompany Lili home when I arrived at her house she invited me in only her younger brother was playing Xbox I greeted him and all of us started talking - how's school - well it sucks - haha Dany told me they hadn't had sex - if the truth I don't know where to start besides always having someone at her house - that's less of a problem if you want to it can be - haha goodnight. At that moment she looked at me with a flirtatious smile just smiled and looked at me then came closer to give me a kiss and told me what are you doing I replied that I couldn't and she said yes we started kissing in the living room since her brother was there Playing Xbox in his room, after several kisses he started to touch my breasts (since my girlfriend was kind of flat) it was a new experience for me, I felt every moment had adrenaline and excitement at the maximum, we went to an uninhabited room that was on the floor below, at that moment she took off her bra, her breasts were big with pink nipples, I started sucking like a kid and was happy when I heard her moans, so I stayed for a while until she got tired of it since that day she wore a skirt, it was the first time I saw a vagina and started sucking like in porn videos, so I stayed for a while until she said shh covered her mouth with her hand to make us not hear her brother, at that moment she told me put it in, I had maximum blood but didn't want to cheat on my girlfriend but the penis was at its maximum, so she unbuttoned my pants and said - look if it's hard - if so but don't know if it's right - At that moment she started sucking my penis God was glorious every second felt like that tickle I couldn't control, after a few minutes she took my penis and introduced it inside her, in my mind all I thought seriously was am I doing this while she moved, I couldn't hold on anymore and started giving it to her, everything tasted until I almost came and at that moment I pulled out - what's up - nothing just don't want to come inside you - nothing happens At that moment I lay down in bed with the erect penis and suddenly felt like she was sitting inside me and starts jumping, I wanted more felt my sweaty body and only saw her face of pleasure while moaning, after that I put her on top, good thing about that room there was a mirror where I could see how her breasts moved to the rhythm of our sex, suddenly couldn't hold on anymore and came inside her, at that moment I had my first big orgasm. After that I said sorry for coming inside and she told me not to worry it didn't matter, I told her not to tell Dany and she said it would be our secret, I got dressed. And I left, I don't know if my boyfriend's brother was listening to us but I left like the happiest man, my girlfriend never found out but still I saw Lili to have sex. Hope you like the story and tell me if you want me to upload more.