The OP said they were polyamorous. I assume that means both of them.
Is there a story here, I wonder?
Yeah, Leia is pretty distant from the actual decision-making here, but she does mention she has girlfriends on the side, so I doubt he’s hiding anything from her. I’m sure there’s so many ‘seeking two people for a threesome!’ types that setting these things up probably gets mundane for the experienced polyamourist.
Leia was aware of what he was proposing; she was a part of the conversation, and he even asked her if she “approved of me”, and she nodded.
Han also told me that Leia knew he was coming over by himself, and said she was actually the one who originally suggested it.
Cool. Pardon my suspicious mind.
Good luck with all of this. They say communication is the key to making this arrangement work, so it sounds like you’re going about it in the right way. It might be good of you to check in directly with Leia once in a while to see how she’s doing with this relationship.
Game called on account of new relationship (mine, that is).
The three of us had planned it for two weeks ago on a Monday. None of us had classes that day, so I was at home waiting…and waiting…and waiting. I text them both to ask what’s up and get no response.
The next day I catch up with Han in the cafe and ask what happened. He tells me “sorry, it didn’t pan out”. Yes, I…can see that. I didn’t see the problem, honestly. Leia has a car, and neither of them had anything particular to do. Did they just not feel like it that day? 
I started to see a pattern that these two have; namely, they plan a lot of fun events (not all of them sex-related), but it hardly ever works out for whatever reason. Also, they both go through some weird mood swings; at times they’re incredibly friendly and warm and welcoming, but much of the time they act pissy, like they’d be rather be anywhere but where they are now, even if they’re surrounded by friends.
None of that really matters, because earlier this week, I happened to meet a guy with whom I had an instant connection. I feel extremely comfortable when I’m around him, and it’s so right and natural just to stand near him and hold his hand. I had feelings for him within a day of meeting him, and he feels the same. I’ve never had something like this happen to me, and I’d like to hold onto it as long as possible. This new person is not really the type to approve of me having outside threesomes, so, unfortunately, that’s out the window. I kind of wish I had gotten the chance to have that experience, and that Han and Leia had been a little more reliable. There will probably be chances later, but at least I’ll always know that I was asked! 
I thought the whole point was that you don’t love them…
anxiously awaits “So I guess I’m having a foursome” thread
Oh, and judges’ ruling: at four does it officially become an orgy?
I thought it went, “twosome, threesome, foursome, more-some” - so “more than 4” would count as an orgy?
And - hooray for new relationships and maybe dodging a bullet with this flighty couple. 
You know what I meant. 
No, orgy starts at six.
So noted.
Does that include the cameraman?
That seems a little early…will you break for dinner?
And, stauderhorse, welcome to the great big world of casual hookups, otherwise known as The Fount of Flakiness. I can’t even begin to calculate how many of these (duos or more-os) never happened because someone just decided they weren’t feeling it and never bothered to actually call and let me or us know, as if we were actual human beings instead of 3-D porn films.
Speaking of sex during movies, my most memorable movie sex moment had to be the ice cream shop scene from Girl, Interrupted. Being in the middle of a romantic encounter while the screen is yelling “peppermint dick!” definitely makes a casual encounter difficult to not laugh through.
Congrats on the new relationship! Now that you’ve had casual sex and emotional sex, you’ll get to the point where emotional sex may be more meaningful than casual sex, but doesn’t make you more nervous. Also, boo for Han and Leia being so unreliable in the time that you were pre-arranging fun time-- it’s never good to be stuck in those situations where you’re waiting on someone and they don’t show.