We put into Sidney late on the fourth night, Anna, Lucy, Hans and myself went ashore. We may have drunk too much and we did a few clubs and bars, but we got back to the ship without any conquests. We went to our own beds and fell asleep. 

In the morning we woke in time for lunch and the ship was underway. We met three new couples, all Australian. 

“Did you enjoy Sidney?” Jo asked.

“We never had enough time, but what we saw was interesting.” I answered. 

“Very friendly.” Lucy added.

It was later when we found the hot tub occupied by the other four Australians, we thought their relationships were fluid.

As we sank into the water, Lucy and Anna, top less, they moved around to give us room. Jan and Paula sat together, Peter and John flanking them. Hans and I sat opposite Jan and Paula.

“Is it OK to go topless?” Jan asked.

“We have had no complaints.” Hans observed. 

The Australians glanced at each other and tops came off.

“We go all the way in the evening.” Lucy continued. 

“Naked?” Paula asked.

“When everyone has gone to bed.” Anna warned.

“So, after we have gone to bed?” John asked.

“That's up to you.” I ventured.

Silence fell on the hot tub, but Paula and Jan were close whispering. I closed my eyes, enjoyed the water and the pressure of Anna against me.

After dinner and most had left we were talking to our new tub friends. Judy arrived with four orange juice.

“Everyone has gone to bed, can I get you anything?” Judy, from the bar asked.

“The same.” Jan asked, and her friends agreed.

“Everyone has gone.” Lucy repeated and pulled her swimsuit off, working hard in the crowded tub.

I stood up and pushed my shorts down. I was not hard, but rather impressive if I do say so myself. 

The orange juice arrived, Judy glanced at me as I sat down and then at Hans as he pulled his shorts down. 

“Enjoy your drinks.” Judy hoped as she returned to the bar.

“I need a pee.” Lucy excused herself as she walked away naked.

Jan stripped, Peter started the air pump and three pairs of tits danced. Soon everyone's swimwear was on the side of the tub.

“Much more comfortable.” Hans declared.

Peter put his army around Paula, and John put his around Jan. 

When the bubbles stopped Peter and John were clearly hard, and Jan had her hand on John's cock. She pulled it away quickly. Peter restarted the air.

Lucy returned, slid into the water between Hans and myself. She kissed me. There was a faint taste of pussy on her lips. I slipped my finger between her legs. I guessed it would not be seen with the bubbles on. Lucy turned to Hans and gave him the same kiss. I turned to Anna and kissed her. Poor Hans had no one to pass the kiss on to, and Anna settled for putting my hand between her legs and holding my cock.

There were now four pairs of tits being bobbled in the water.

Peter finished his drink and suggested going to bed. As they got out his hard hairy cock was on full display,  but disappeared in a towel quickly. John was a bit more relaxed about getting out but still as hard.

They started for their cabins. 

“I forgot my drink.” Jan remembered.

She came back, whispered something to Lucy and picked her orange juice up.

“Yes.” Lucy said quietly. 

I let Jan disappear and asked. “Yes?”

Lucy smiled. “She wanted to know if we were a 4sum.”

“Two more cocks?” Anna hoped.

“A single pussy?” I cautioned. 

“He has no ambition.” Lucy said.

“He got my nickers off fast enough.”

“I am very glad he did. “ Lucy told us as she handled Hans.

“So am I” Anna said sitting on the side of the tub with her legs wide open and pulling her pussy open.

“Which one do you want first?” Lucy asked.

“Peter.” Anna answered.

“Nice cock, but a bit shy.” Lucy commented.

“We can fix that, just offer a pussy.” Anna observed.

“Would you fuck them on the side of the tub?” Lucy asked.

I was feeling a little guilty,  and wondered if anyone would see us, but I knelt on the seat and pushed my cock into her as she held herself open. We held each other in place, as I careful fucked her. I did think about four women getting fucked on the side of the tub, men rotating clockwise taking each in turn.

The thought was enhanced by Lucy. “Fuck me Peter.”

“You are such a slut Lucy.” Anna condemned. 

“I am, I hope you are.” Lucy replied. 

“She is a bitch and slut.” Hans confirmed. 

“The best kind.” Lucy observed. 

My knees were uncomfortable but I kept fucking her. The water was slopping over the side as Hans and I fucked each other's women. Lucy was panting somewhere behind me. I was uncomfortable but excited. 

Anna was whispering in my ear. “Fuck me. Do me like a slut. Aah! I've cum.” 

“I noticed.”

“Fuck those Australian sluts.” She continued to whisper. 

“You are as bad as Lucy.”

“Is that good?” 

“It is.”

She let out another Aah and I gave her a last hard thrust and we nearly fell out of the tub, I flowed into her. I filled her.

We sat back in the water. It was only half a dozen thrusts and Hans filled Lucy. We all sat and recovered. 

“Next time we do it here, I want a cushion for my knees.”

“Let's go to bed.” Hans suggested. 

We went though the bar, naked but drying ourselves.

“Carol will not like that, Lucy. Best we don't tell her.” Judy advised. 

“Thank you, we will not do it again, Judy.” Lucy apologised.

We had some more fun before we fell asleep.

I will tell you what happened a few days later, but you will have to wait.