My father's fat friend's daughter

I call myself Joel, I'm a tall skinny guy of 30 years old, I live alone with my dad who is separated, my dad is a mechanic and has a workshop at home for his whole life, his friend Mario is like my uncle, he works with my dad here in the workshop, he has a daughter named Macarena she's a chubby girl of 18 years old shy and a bit embarrassing, she used to come to my house since she was very young always at home so she wouldn't be in the workshop among men, I practically saw her grow up, she would always stay with me at my mom's when she lived with us, my mom gave her snacks after school and helped her with homework, when my mom left she kept coming to my house and I made her snacks but she did her homework alone, she was chubby from a very young age and started developing her body early already had big tits that men would look at her with desire as if she were a girl, even I got attention, I imagined how nice it would be to see those big tits on a little girl but always treated her like a niece, she grew up without her mother wanting to for that reason with 18 years old is shy and awkward but has a beautiful body despite being chubby. One weekend she came with her dad to my house to eat, after we ate the four of us I started playing video games with her for a bit, after an hour my dad said they had to go help a friend who was stuck on the road and would be late for hours so when Macarena wanted to take her home because he was going with Maca's dad, they left and I stayed lying down on the couch playing with Maca until we got bored, we started chatting like uncle and niece and after a while the topic of whether she had a boyfriend came up, she said no that she hadn't even given her first kiss, I asked her why a girl of her age still didn't have a boyfriend and she said look what I am, in school nobody gives me attention and more so with the clothes my dad buys for me, I told her it will come along and she'll find someone suitable. I wish it was from a kiss before I turned 20 and we started laughing a lot and then I don't know why, maybe out of pity or because I told her if she wanted me to give her a kiss and she got very red but said yes and went quickly to the bathroom, I stayed thinking about what I had proposed being that I saw her as my niece and I saw her coming from the bathroom, wearing jogging pants that marked all her fat pussy and those big tits, we sat on the couch and I said let's go with the kiss, we approached and she closed her eyes and we started kissing with great enthusiasm, she was a bit clumsy but kissed well and I don't know why my cock stopped while I was kissing her, after kissing her she saw that my cock was getting hard and laughed and said, 'oh, it's big, right? Jaja, I've never seen one like this! Never have I seen a penis, I told her if she wanted to see it and she shyly said yes, I pulled out my 22-centimeter cock which is fat and she said it was very big and asked if they all are this size, I told her there are all sizes, she looked at me little like she was giving me shame and I told her to be brave and touch me, grabbed her hand and led her to my cock, she touched it with shame then I told her to close her eyes, when she closed them slowly I kissed her again and after that I pushed her head slowly towards my cock, she opened her mouth and started sucking the head and a little more because it wasn't going in her mouth, I told her to relax and play with her tongue and after that she was sucking me a bit better, I started playing with her enormous tits and touching her nipples and couldn't hold back, while she was sucking me I came like never before, she kept sucking until all the cum came out, I told her it was beautiful and she was very shy while cleaning her mouth, afterwards she asked me to take her home, when we arrived she bid me farewell with a kiss and a smile...