I waited all summer for this seaside holiday! I bought a nice pink bathing suit and turquoise flip-flops to look trendy and sexy at the beach! I just love the sea, the breeze and the soft golden sand that sticks to my feet! I also very much enjoy sunbathing and getting a proper tan! I could lay for hours in the sun, on my back or on my belly to get the ideal tan while my brother would be bored as fuck and ask me to grab a cold beer for him. Me and my brother have a special relationship, we love each other very much and... we fuck! Yeah, you heard it well, we fuck, even if we are so closely related! In fact, this taboo thing makes us want each other even more, knowing that's an forbidden relationship. Our parents, of course, have no idea about this. We went with them to the seaside and even if we had separate rooms we didn't try anything because the walls were sooo thin and we were afraid to be heard by them. I finally got the tan I wished for, but I also got tan-lines and I don't like that at all! We didn't go to a nudist beach so I kept my bathing suit on which caused a patchy tan, like half of my boob surface is tanned and the other half... not! I asked my brother to check those tan-lines on my big boobs and ass, stripping slowly and letting him discover how those white lines decorate my sun kissed body. We were extremely horny, you can imagine for yourself, a week of napping in the same bed and no fucking brought us to our very limits. He told me that it doesn't look bad, and basically every one has them, more or less if they didn't sunbathe nude. I asked him to check my ass by untying my bikini and I went on with this "discover my tanlines" game until I felt his hard wet cock rubbing against my pussy, and then asked him to look "deeper" for those DAMN tan lines! The moment he stated penetrating me I screamed from the intense pleasure I was feeling. I was laying on my belly and he was on me, riding that tanned ass and pushing that cock deeper and deeeper inside my pussy. We fucked a lot, changing the positions, spooning, with me teasing him with that round ass of mine. It's wasn't a long time until I came, an orgasm that tensed my muscles and covered my brain in a shower of sensations. I also sucked him off, looking at him with love and doing my "job" with ardor. I licked it, especially the tip and I didn't forget to deep-throat it a lot, taking all that cock up my throat multiple times in a row. Sucking it, I got horny again so I wanted to ride his dick and bounce my bodacious tits in his face, he adored that! I came again, doing some sort of circular moves that help me reach my G point. I rewarded him for it with a new session of sucking and deepthroating, making him cum in my open mouth by rubbing it faster and faster and squeezing the hell out of it. He came, filling my mouth with his precious juices which drooled down my cheek and tits. I hope our parents will never find out what kind of relationship do we have, as brother and sister!