They dare me to get fucked by my brother

This weekend, my friends came over. Perfect weather for sunbathing and the pool. My brother was the only guy out. As girls do, we talked about sex and relationships, and my brother had a few comments. He said he didn't have those problems because he was a man and came to me. True, by the way. But on the subject of sex, he told me how he left me begging for more and how he always put me first. Also true. He added that his oral skills were making everyone's legs shake. "Why don't we show them what I mean, baby?" he asked. The girls started chanting, "Do it!" So we did. He untied my bikini and started masturbating me! His tongue is fucking amazing. I started putting on a show, moaning and grabbing his hair! He brought me to orgasm in less than two minutes! He got a little carried away, though... he took off his underwear, and before I knew it, he was fucking me in front of my friends! They gathered around us, some pulling their bikini tops down and playing with their nipples, and some were even more daring and touching each other. When we finished, he squirted his cum onto my stomach. Everyone applauded, and the rest of the day went on as normal once I washed up.