Here's my impressions, FWIW. I don't know if it helps you any.
I do not know what I should have done. If anything. What he should have done, although I have a pretty good idea on that. And where to go now.
You could have said "Hey, I'm sick guys. This was not coming over for group sex. This was coming over for keeping me company/doing comforting things while sick."
He could have said "I was falling sleep. I do not want you groping me when I'm not fully present. I want you to ask consent first."
You decided to let her take the lead. She basically did, and then you did not like it.
- You discovered you prefer she ask for explicit consent -- if he wants to receive X and if you want to be watching it.
- You discovered you don't like him doing mixed messages. Telling you only group sex, and then being ok with making out/hand jobs in front of you.
- You discovered you want him to ask too. Because he's not asking your consent either - if you want to be watching them do sexy stuff as a couple and you as an observer.
- You discovered maybe having serious convo over text is not the best medium. Leave text for stuff like "Luv u!" or "Don't forget to buy milk like you said this morning" level stuff. Not talking about your sex life or this new FWB thing. Do that in person to minimize misunderstandings.
I don't mind my spouse having another lover, but I am going to be PISSED if I open the door with a trail of kids behind me and see them going at it at the kitchen table. Not that there's anything wrong with kitchen table sex, but come ON! A heads up would be nice. Not just springing things on people willy nilly.
You have had things sprung on you and it did not feel nice. Speak up about it.
I think you guys need to talk and put it all on the table PLAIN.
Maybe these worksheets will help you have those conversations.
http://openingup.net/resources/free-downloads-from-opening-up/
Especially
http://openingup.net/wp-content/uploads/2011/08/Open-Relationship-Checklist-OU.pdf
Because you all have to have the same definition of "FWB." Not one person thinks it means A, and another person thinks it means B and another person thinks it means C. You could also talk about consent.
You could even do that sheet in colors -- green for "good to go, no need to ask me", yellow for "depends on situation. Proceed with caution. Ask first." Red for "No. Not likely ever."
Then compare each others sheets and see what lines up and what does not. Err on the side of caution and make the group consensus sheet for this period of time, and check in again X months out. Over time maybe some of the yellow things becomes green or maybe not.
But at least it gives you a conversation tool to help you define and articulate what common ground right now is gonna be. Right now "muddling your way along" sounds like more like a drag than fun.
You guys also don't seem to talk in trio. It's he said/she said/she said and there might be some triangulation going on. I cannot tell.
I do think it is not enough for him to say to you "group work only" -- he has to say it to her too. Make ALL the partners aware of where he stands clearly. And if he changes his mind, there could be an expectation that he TELL people that.
She's got to reign it in some and ask for explicit consent more often, esp while things are new. Not just consent to receive sexy acts, but consent to be watching it. If you feel sick to your stomach you might not WANT to be watching all that go down right then even if you ARE the other FWB. Some common courtesy, please!
And you need to reign it in LESS and start speaking UP more. It's ok to vent here after the fact. But I think what will help you more is to start speaking up more in the moment. Nip this stuff in the bud and advocate for yourself more so you are less annoyed by behaviors and less confused for "what kind of relationship is this?"
It doesn't fall out of the sky. YOU create what kind of relationship this is together. You all agree on how you want to be together. Have the talks you need to be having and actually sort all that out.
Galagirl