SO and I have been in the LS for around a year. We've been together for 10 years. We have rules and boundaries set up for safety and attempting to keep our relationship solid and safe. We are normally transparent as far as communication and everything is talked about at this point since it is still relatively new to us. Here is the situation...
SO and I were invited to hang out with some chocolate friends and their vanilla friends for dinner and drinks with the original intent of playing after. Well, due to some minor health issues, I backed out of playing at least a week in advance with the intent of still going and supporting my SO if he wanted to play. Then, the day of the event the other wife said she wouldn't be able to play because of a small medical issue of her own. So we agreed on no play because neither woman could. So, we go and have dinner, and everything is normal. Other wife is getting a bit tipsy and has been sending pics to my SO (which is normal for them even if nothing is happening). We get set to leave and my SO and I had ridden with the other LS couple we are friends with. Her husband drives, I'm in the front seat and my SO and other wife are in the back seat. Well, I didn't know what was going on but I heard 'You're a tease' come from the back seat. I kind of glance back and didn't notice anything weird but my SO is behind me and I can't see him as it's dark and I can't turn the whole way. She passes out for about 10-15 minutes on our drive and then I hear them talk about her passing out for a minute, then it's quiet. I suddenly hear 'You're a tease' again and then she says 'Come here' and I hear them kiss. Now let me specifically say that he has kissed many women in and out of my presence at this point (and much more) and I have never felt hurt like I did right then. It was a weird, sad kind of hurt. Not like jealous or envious or angry. I felt like the situation had changed without my knowledge or consent or out of any consideration for myself or other husband. It stopped there but I didn't say anything right then because my emotions we're not in check. I just pushed it back, stewed on it for our drive home, which was hours long, and not once did he talk to me about it or tell me what happened. We ALWAYS talk about these things after as part of our after care even if nothing really happens. So, I didn't want to go to bed angry and I asked. 'So, I heard something going on in the back seat, what exactly happened?' he did say they kissed but I had to press to find out that he was sensually caressing her in a spot that is one of her major erogenous zones prior.
So, I have a few problems with this. One of our rules was broken. Also, I felt hurt because I was under the impression that nothing was happening. To top it off, she had been drinking and I wasn't sure that she could make clear decisions at that point of time. We have been modifying the rules a bit to accommodate situations like this. Establish what to do....but, he thinks things should happen organically. If someone says no but later changes their mind and starts flirting, with no further discussion or confirmation, it's game on no matter what. He feels it is more natural and spontaneous. Which is great, when everyone is on the same page. Based off of conversation, I was under the impression that everything was off the table and it would be a vanilla night. That, to me, warranted clarification on what would or could be happening to begin with as they had set my expectations of the evening by saying no. He says we would end up having to 'stop and ask permission' before taking things further which isn't natural or spontaneous. But I feel like lines could be crossed and people offended if everyone isn't on the same page. We aren't sure how to make this into a more coherent rule that works for both of us. I want spontaneous encounters but I feel like if anyone is changing their mind on anything it needs to be discussed. He says it should happen naturally that if it goes there no discussion is necessary if signals are being sent that it's go time. We don't know how to balance this out. Any help is appreciated.
TL;DR Have to create a new rule due to a very specific event and seeking help on making it coherent.