Cruise With Sis
Copyright© 2026 by Axad Artin
Chapter 4
Action/Adventure Sex Story: Chapter 4 - Getting dumped by girlfriend on a cruise is usually a terrible thing to happen. But his sister suffered the same and things weren't bad at all anymore.
Caution: This Action/Adventure Sex Story contains strong sexual content, including Ma/Fa Consensual Fiction Cheating Incest Brother Sister Oral Sex
Thursday, Jamaica
I groaned when the alarm went off. I felt sore and tired. What did I do last night? Then I remembered.
I turned towards Caitlynne, who was sitting up and stretching. What a marvelous view. “Any regrets?” I asked.
She laughed. “None. We’re both adults, both knew what we were doing and both needed it. We’ve been given a lot of lemons on this cruise and we made some lemonade. Let’s go - we have a shore excursion to catch.”
The excursion was a catamaran cruise to Dunn’s River Falls. We struck up conversations with other people on the catamaran several times, but it always turned awkward - when we told people where we were from, they’d ask how long-distance dating was working out. When we told them we were brother and sister, they’d say “Oh”. I felt like we had a neon sign over our heads that read, “BROTHER AND SISTER WHO ARE FUCKING.” The trip itself was fantastic - we enjoyed sailing on the beautiful water, snorkeling at a coral reef, swimming in a lagoon and hiking up to the summit of Dunn’s River Falls.
Back on the ship, we made love before napping. Our lovemaking session was very playful, and we spent a lot of time talking about what we liked in sex. We did a tushy ride so Caitlynne could see what it was like. She guided me through different techniques for eating her pussy. We fucked in four different positions, the last of which had me lying on my side behind her with her wrapped in my arms. After I came, we drifted off to sleep with my wilted cock still inside her.
After napping, we worked out, then headed back to the cabin. When we were almost there, we saw Karen and James hand-in-hand walking towards us. They turned around and went the other way. I had thought the sight of them would be painful, but it wasn’t bad with Caitlynne by my side.
Now that we were lovers, dancing was more fun and arousing. Once we got back to the cabin, we attacked each other. We fucked like animals - constantly switching positions, tumbling all over the bed, switching to oral sex, then back to fucking. I didn’t go soft until I dumped my third load into Caitlynne. I was exhausted and fell asleep quickly with Caitlynne cuddled against me.
Friday, San Juan
We spent the whole day on the island. We explored the city, had an incredible zipline adventure, spent several hours at a gorgeous beach, then had a wonderful dinner in San Juan.
The whole day, I struggled with the issue of public displays of affection with Caitlynne. I loved her and had a great time with her, and it was natural for me to want to show my affection for her by holding hands, kissing, and hugging. Tourists were everywhere as San Juan was a major port for cruise ships. How many of them were from our ship? Would anyone recognize us if we hugged and kissed on the beach? I knew from men approaching us at the dance club that we were known by people we didn’t know. Probably many people had gossiped about us as we were part of a sex scandal that had happened right before their eyes. If someone from our ship saw us, what would they do? Would they tell Karen and James? What would those two do if they heard we were acting like lovers? Would Karen tell my coworkers that she had been glad that she had broken up with me when she had found out that I had rebounded with my sister? Caitlynne and I held many whispered conversations on the subject. In the end, we only kissed and hugged when we were sure we couldn’t be seen. That was more dissatisfying than Karen’s only letting me hold her hand.
The frustrations of the day seemed to affect our lust for each other. Our sex after dancing, while still hot, wasn’t as torrid as the two prior nights.
Saturday, at sea
I woke on the last day of the cruise to the sound of torrential rain. As my grandpa said, “Like a cow pissing on a flat rock.”
For the first time on our cruise, the ship swayed, pitched, and rolled. We both felt a little queasy. I had researched sea sickness before the cruise, and we did the recommended steps - took some Dramamine, ate some crackers, and stared out our cabin window towards the horizon. When we got tired of watching the rain, we lay on the bed and talked until we drifted back to sleep.
At eleven, we woke and went to the gym. It was packed. There wasn’t that much to do on the cruise ship. With the rain keeping everyone inside, the few places we could go were overrun. We left and had lunch first. When we came back, we had a long wait before we could get on two cardio machines, and they weren’t close to each other.
After working out, Caitlynne and I weren’t in the mood for adventurous sex. We did lots of strokes and kisses, slowly stoked up the fires, then released them in the good ol’ missionary position.
After a nap, we did some shopping. “We’ve got around eighty dollars left of shipboard credit,” said Caitlynne. “How do you want to spend it?”
“You spend it.” I didn’t want any mementos of this cruise. I had had a great time with Caitlynne, but that didn’t compensate for losing Karen.
“I could buy some duty-free booze, but I’d rather buy a nice dress. Would you mind? It’ll cost more than our credit, and the difference will go on your credit card.”
“Go ahead. Get something really nice.” I dropped my voice to a whisper. “A going-away present for my cruise girl.”
Caitlynne smiled at me, then started looking more seriously at the dresses. “I wish I had taken some of the shipboard credit with me when I changed cabins. As Karen and James hardly drink, they probably haven’t spent much of it.”
“They probably bought lots of souvenirs of their early honeymoon. We’ll call it their wedding present.”
Caitlynne looked at me. I knew she wished I wouldn’t give up so easily. I didn’t know what she wanted me to do - chase them down and demand they buy her a bunch of duty-free booze?
Caitlynne bought a peach-colored sundress that looked pretty on her. We wandered down to a place which served hand-scooped ice cream. We got a cone each and had to wait to get a table as the shop was full. When I was about halfway done, I saw Karen and James in swimsuits walk into the shop. They saw us and started to turn around, but I waved them in. Once they got their ice cream, they started to leave, but I waved them to our table.
“What the hell are you doing?” whispered Caitlynne.
“I have to get used to seeing Karen, and I want to start when I’m with you.”
Once they sat down with us, I asked, “Have you two had a good time on the cruise?”
“Great time!” said James with a big smile. He told us about the ziplining and tubing they had done in Belize and the swimming with dolphins they had done in the Grand Caymans. It didn’t appear to cross his mind that Caitlynne and I might get upset about all the fun they’d had on our dime.
As James talked, I stole occasional peeks at Caitlynne and Karen. Caitlynne looked like she was ready to lunge across the table and choke James. Karen - well, it looked to me like she was trying to hide behind her ice cream cone.
James was about to tell us what they did in Jamaica when Karen interrupted by asking, “Thomas, what did you do in Belize and the Grand Caymans?”
I looked at Karen when she talked to me, and it was like a knife in the heart. She was so beautiful. She had an elaborate braid that made her hair look more gorgeous than ever. She had spoken in a soft, gentle tone that I loved so much to hear. I felt like crying.
Caitlynne jumped in and described our trips. I added a little about our time in Stringray City. If it was this hard to talk to Karen with my sister/lover sitting next to me, what was it going to be like in the break room at work?
Once we had finished, James told us about their riding horses on a beach in Jamaica and their going on a snorkel and picnic cruise in Puerto Rico.
“Thomas, what did you do in Jamaica and San Juan?” Karen asked.
Why is she asking me?
Again, Caitlynne did most of the talking. I talked a little more than the first time. Still, it was so hard.
“Well, it was good seeing you,” I lied as I pushed my chair away from the table. Karen was the only one with ice cream left - it looked like she had barely touched hers.
“I’m going to pay for my cruise,” Karen blurted out.
“What?”
“I’m going to pay you for my share of the cruise expenses. When we get back to Boston, I’ll come over, we’ll go over the cruise expenses, and I’ll pay you for my share. It’ll take me a while to get the money together, but I’ll pay you as soon as I can.”
“That’s nice of you, Karen. It really is. I wasn’t expecting that.” Karen was the sweetest person I knew. “I’ll throw everything into a spreadsheet and mail it to you.”
I looked over at James. All of us looked his way. Would he make the same offer?
“I’m going to do an errand, then I’ll meet you at the pool,” said James to Karen as he briskly exited.
I’ll take that as a “No.”
“Good talking with you,” I said as I stood up.
Karen had an odd look on her face. “See you tomorrow at the airport.”
I winced. I wasn’t looking forward to that flight. “See you then.” I considered getting a different seat when I got to the airport.
Outside the shop, I told Caitlynne, “Whatever Karen gives me, I’ll split with you.”
“Thanks. That’ll help a lot.”
“It’s only fair.” We headed back to our cabin. “What did you think of Karen’s behavior? I expected her to be all happy and bubbly now that she’s with her true love, but she didn’t act that way at all.”
“I think you’re killing her with kindness. She’s feeling guilty as hell as she knows she did you wrong. If I were in her shoes, I would want you to yell at me, call me names, be ugly and nasty. Then I would feel justified.”
I didn’t see what there was to be angry about. Disappointed, yes. But Karen had been honest with me, had told me that she didn’t love me. Who was I to say that she had to stay with me rather than her true love?
Once Thomas and Caitlynne left, Karen walked to the trash can and threw her ice cream away.
I’m so stupid. So blazingly stupid.
She waited a few moments for Thomas and Caitlynne to be out of sight, then left the shop and stopped. James would be expecting her soon at the pool. She didn’t feel like talking to James. Or talking to anyone. She decided to go to the cabin and do some early packing.
It had seemed so easy last night.
As she had laid next to the sleeping James, she had come up with a plan. She’d keep James at bay today, dump him tomorrow morning, then rekindle her friendship with Thomas on the flight back. When she went over to Thomas’ place to talk about the cruise expenses, she’d either ask him out on a date or outright seduce him. They’d be back together within a week.
Her first rude awakening had been this morning at the mobbed indoor pool. As she had been talking to James, a little grandfatherly gent had come up to her.
“Weren’t you with another guy at the start of the cruise? Tall guy?”
“Yes.”
Karen had been sick of people asking her that question. Because of their height difference, lots of people had noticed her with Thomas. She had felt bad telling people about breaking up with Thomas and going off with James back when she had thought James was God’s gift to her. By the time this little gent talked to her, being asked about Thomas had made her feel many times worse.
“When did you break up with the tall guy? Monday? Around lunchtime?”
“Yes.” She had wondered how this man knew.
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