Let me tell you about ourselves, at the time this happened we were in our early twenties; I'd had may sexual partners before I met Sarah, but on meeting her I'd never considered sex with anyone else. Sarah had only had one other partner, but she had confessed on our second night together she had only had full sex twice, then he cheated on her and that had ended their relationship. Sarah was a 5'2 tall and dark hair and electric blue eyes, 34B breast and upon my insistence was now fully shaved. I'm 5'10 and at that time a keen swimmer so I was very trim and lean.
We were invited to join our friends at her family's holiday flat in the south of England for a week's holiday. I'd gone to school with Clark and we had remained friends since. By coincidence he'd met Anna about the same time as I'd met Sarah and we double dated a number of times but never had we holidayed together, so this was going to be a first. Clark was always reserved but Anna was very outspoken and wore the trousers in their relationship. I'd noticed on our nights out that it was always Anna who used the sexual innuendos and directed the talk to sex. Once the holiday was suggested we set a date for late June and we joined them at the flat. The flat was a large two bed arrangement with a limited sea view. But all the rooms were spacious and both rooms had en suites.
On the first night and after a good meal at a local pub, we went home to carry on drinking. After about an hour we were all very drunk and for a joke (or maybe it was well planned) Clark brought out a copy of a "Sex 365: A Position for Every Day" book we all laughed and were joking at the various positions and bragging about the ones we had completed.
The chat and mood was getting very brazen and everyone was asking the other to explain more. Well the night went on with more drink and all of us were getting intimate with our partners. Well eventually the passion took over and Anna whipped out Clarks tool and set to work on a blow job. I could tell she was well practiced; Clarks cock looked to be about 7" long the same as mine but only half as wide as mine.
Sarah is not an exhibitionist but I coaxed her to copy and eventually both couples were having sex in the same room. Although the sex was conventional we had removed most of our clothes and I could see Anna's larger tits. Afterwards we all were comfortable, and sat there naked in each others company. Anna was taller than Sarah at about 5"5 tall she had ample tits a pierced naval and a very hairy un-kept bush, other than the hair I had no complaints. Clark was slightly hairier than me and as I said this cock was about the same size as mine erect but flaccid it was slightly longer than mine. We sat there and in our post sex glow had more drinks and relayed our sex stories. As we carried on the drinking the conversation was much more open this got both of us men aroused with rapidly growing cocks.
No one could wait any longer Sarah was content to gently stroke my cock. Then out of the blue Anna came to Sarah and touched her tits and tried to kiss her. I think Sarah was surprised because it didn't go well. She got up and left the room. As a couple we hadn't really discussed about sex with another person at that time so I think Sarah was shocked. Anna had left the room as well and Clark followed her. Sadly that ended the night.
Later in our room we talked about what had happened, and told me she had never thought about kissing another girl, yet alone sex with her or swapping. We agreed neither of us was opposed although Sarah didn't want to watch me having sex with another woman, but she did say if we swapped it would be at the same time, she also added that she was surprised by Anna's advance and remarked on her un-kept pussy.
Day 2
The next morning Anna apologized and agreed it was nothing, Anna and Sarah talked alone for a long time.
That night it was raining and we stayed in for a takeaway, and started early on the drinking afterwards we played strip poker I lost and Clark soon followed, then out came the book and we randomly picked pages and recreated the position but other than touching no penetration.
This worked well until we realized there were 200 pages in the book. The crunch time came as the later pages were dedicated to group and same sex. Clark got to the first same sex and he laughed as the two girls were shown gently massaging each other's pussy, Sarah seemed quite happy since their conversation. So they re-enacted the page, then they stopped looked at us and said it was now our turn, it took a while for the penny to drop but when it did we both looked at each other and just like when you need a painful injection we tensed, but knew it had to be done. I reached out and took Clark's tool, the first one I'd touched. Clark then hesitantly joined in and gave me a few strokes, we didn't continue this for long, both girls were watching.
Clark then stood and left to the kitchen, I was not sure if he was embarrassed or shocked. Sarah and Anna came over to me and they both kissed me (a reward for being brave). Clark returned and stood in front of us, Anna went forward and grabbed his tool for a blow Job but he shot his load on first contact. Anna had spunk all over her face and tits, Clark was not happy. Sarah said she'd never seen another man come, to which I added neither had I.
Anna then asked me to come for them so I stood up to proudly do my chore when Anna asked Sarah if she could wank me, so off she went and in a jiffy my load hit her face.
Silence and time for the bathroom, coming out Sarah was there and I asked if she wanted to take it further with Anna and she drunkenly smiled. I didn't realize what it meant for me. We returned to the lounge, Anna and Clark was well into each other, so we got it on. Next thing Clark was standing next to us and Anna hands are in our action.
Then Sarah and Anna kissed full on Anna then lifted my hands from her boobs and placed it on Clarks cock he wasn't upset. I gently rubbed him but he pushed is cock to my face and I had to take it. I chocked a lot but Sarah said "take it slowly". I carried on sucking him for a while then stopped and looked up to see Sarah was eating out Anna. I returned to the task and gave him a blow job until all he wanted was to fuck.