Last summer, I went on a cruise with my family. My boyfriend and I (we are both 21) and my brother and his best friend (who are both 19) stayed in the same room together to save money. I have always had a crush on my brother's friend and we have casually flirted with each other in the past. The first night of the cruise my boyfriend and I had sex while my bro and his friend were out at the night club on the ship. The next morning my brother and bf went to the gym while the friend and I hung back in the room. He told me he was going to have blue balls all trip if he was going to see me walking around in my bikini and underwear the entire time. I felt sorry for him and told him I could help him out if he promised not to tell. I also was really horny and wanted him anyway. He thought I was joking until I pulled down his shorts and started to stroke his dick. I had him lay down on his bed and got some lotion. I then gave him a nice handjob until he came all over his stomach. I told him if he was good I might give him something more during the next few days. He was very quiet and discrete about the whole thing and so every night my boyfriend and I would fuck and in the morning when he went to the gym with my brother, I would have fun with the friend. The cruise was 7 days, so the next two mornings I gave the friend blowjobs and let him cum in my mouth while I had my shirt off so he could see my big tits. The rest of the mornings I fucked him bareback and let him cum in my pussy. We had to be quiet and fairly quick in case anyone came back, but it made it more exciting and I came so much. He loved watching me bounce up and down on his dick. The friend and I have not fucked since because he went away to the navy but I still get wet thinking about this trip. I am still with my boyfriend and he has no clue what a slut I was.