So Alison suggested we go upstairs.. We left the jacuzzi and went upstairs and into the sauna suite. No one was dressed, so we took our costumes off and left the by the door, showered and entered the large sauna. Well there was room I would estimate for about thirty people and there must have been about twenty already in there. Again all were couples and as we entered a gap was made to clear space for us. Alison sat on a lower bench and I sat directly behind her on a higher bench. Most others seemed to know each other and there was light conversation between several couples. All were naked and most sitting up as it was too crowded for people to lie down. I saw one or two couples sat touching each other but in a platonic rather than sexual way. Others came in and again the ritualof moving up to make space occurred. A young girl next to me,big and busty squeezed up so her thigh rubbed against mine. She apologised but did not move it away and I felt the warmth of it start to affect my loins.With that the door opened and the older couple from downstairs came in. I was sure it wasnt my imagination that they seemed to look around till there eyes settled on Alison and myself. There was no gap by us and the seating in this sauna was in a U shape and so they sat a short distance away at right angles to us. I saw that he was clearly looking at Alison who was sitting there between my legs and in front of me totally naked. I thought I could see her looking in his direction also. This got me really excited and I felt my cock starting to get erect. I stood up and put my towel in front of me to mask my throbbing cock and pushed past Alison saying something about being too hot. I exited the sauna and had a cold shower. I expected Alison to follow me but she didnt. The older lady did however. Even I was starting to think this was more than a mere coincidence but not having witnessed any overt sexual activity anywhere was uncertain what to do. Also Alison and I hadnt said what any boundaries may be so I went over and got into the jacuzzi . This jacuzzi was large and basically rectangular with room for perhaps six people on either long side to face each other. Although there were several other people milling around outside the sauna in a general rest area the jacuzzi was in a screened off section and was empty. I figured it was a safe place in case my erection came back. I was excited equally by all the naked flesh on display but also by the thought of others looking at Alison I was also slightly surprised by how keen she had been to shed her costume and sit with so many others. The bubbling waters did nothing to stop my semi getting hard again and when the older lady came from the showers and around the partition to stand by the jacuzzi facing me my cock reallly started to throb. This had to be more than coincidence. I became even more sure of this when she stood directly opposite me with her legs apart and put her hands through her hair. This had the effect of lifting her large breasts up and out and I noticed the dark nipples and the carefully trimmed pubic area. This time I did not hide the fact that I was clearly looking at her. She stepped down iinto the seat opposite me. The rest of the empty jacuzzi was off to my right hand side. She spread her arms out across the top of the side behind her, which had the effect of lifting her breasts clear of the foamy water and I had a clear view of her magnificent breasts which contrasted with my Alisons small but perfectly small and pert breasts. The next thing I felt was her foot, under the water rubbing up the inside of my thingh to my groin. Her eyes were closed and her head tilted up so I was free to keep staring at her tits jiggling in the bubbling water. Her foot found my now hard and throbbing cockand started pressing against it. I took the opportunity to take my outer leg and run it up the inside of her thigh under the water. I was carefully watching her face just in case there was any hint of indignation, but she stayed with her eyes closed fscing the ceiling, her with one foot stroking my cock and me with my foot pressing into her warm pussy. Above the water no one could see what was happening, which was as well because after a couple of minutes my Alison came out and sat next to me to my right. I was mortified and uncertain of what the reaction would be and removed my foot from the stranger opposite. Her foot meanwhile continued to play with my cock. Alison said she liked it here, and I wondered what she would say if she knew what was happening under the water. However things got even more strange when the older man came round the side of the screen to be with his wife who was still rubbing my cock with her foot. He was a well preserved 40 or so, good build and with a long circumcised cock which appeared to be sticking out a little more from his body than a purely flaccid one would. I saw Alison was looking up at his member as he came directly opposite us and lowered himself into the jacuzzi next to his wife. Instead of getting all the way in he sat on the edge. dipping his legs from the knees down into the wateras he rubbed his wifes shoulder. Her eyes opened and she looked at him. She also looked over and registered Alison was in the water with us. She smiled slightly and I felt her foot withdraw. She turned to her husband and placed her hand on his thigh. His cock clearly twitched and I could tell Alison was transfixed. The lady opposite sat up from her previously slightly outstretched position and her massive boobs broke clear of the water. The man reached over and touched her to the shoulder before cupping one of them briefly while she reached out touching his leg causing his cock to now become fully hard. He looked over and smiled at Alison who I noticed was transfixed on his large cock which had grown to almost monstrous proportions and was throbbing and purple headed. His wifes hand had slipped under his thigh and was, I thought playing with his balls. I felt Alison press alongside me under the waterbut matters were the interrupted as a group of four noisy friends came round the screen and got in the other end of the jacuzzi. This seemed to affect the couple opposite us as the guy immediately slid down and into the water presumably to hide his erection . I touched Alison under the water,my fingers finding her hairy cunt easily and she in return grabbed hold of my cock and looked at me in surprise when she found it rock hard. The couple opposite were staring at us which made me feel only more randy. However within a couple of minutes more people came to the jacuzzi and discretion being the better part of valour we stopped our groping and sat enjoying the warm waters and stared at the couple opposite who were staring back. All too soon we realised we would have to leave as the mixed session was ending and it was entering members only time. I went to the male changing room and Alison the female. While I was in there the older guy came in and asked me our names and were we new. I told him who we were and explained about the trial visit. He confirmed he was Steve and his wife Val, they were members and came here 3 or 4 times a week. I wanted to ask what happened in members only time but didn't. The conversation between us took place while I was getting dressed but he just stood there naked,apart from his towel draped over his shoulder. I thought I caught him paying a little too nuch attention to my cock, but to be fair I was looking at his a little . Whilst it was no longer hard it was still thick and impressive. He told me the would be at the club same time next week. He made no reference to what he may have witnessed myself and his wife do and simply said he thought my wife had a glorious figure and that he and his wife had enjoyed naturism since being about our age. As I left the changing room he exited with me, still naked and we met Alison in the corridor. It seemed so strange seeing her fully dresed right next to him totally naked and I noticed she still couldnt keep her eyes off his cock. I hoped his wife may appear still naked for one final meeting so I could remember her contrasting beauty one more time but unfortunately she didnt. We drove away in silence and it was some time before we agreed the facilities were nice, then we agreed we had both found it liberating being naked and with others. It was only in bed that night as we had the fuck of our lives that we both admitted we had been turned on incredibly by the other couple and Alison told me that as she had come out of the sauna and before coming into the jacuzzi the older guy had come out right behind her and also gone to the showers. however as he had passed his semi erect cock had rubbed against her arse cheeks and this hed really turned her on and she couldnt wait to see his throbbing cock next week......