So I've been in this LTR for about a year and don't have a lot to complain about. Sex is great, not too many shit tests, overall good. I've been wanting to have a threesome with her and another girl for a while to check it off my bucket list, and have been making joking remarks about it, to see her initial reaction and then, once I found out she was aversed to it, to slowly warm her up towards the idea. I've not gone the hard-line route ("we're gonna do this or else...") because it's not something I'd want to break up with her over. It would be cool though. So over the months of making comments about it or ridiculously overtly checking out other girls in front of her, she's become a lot less offended and sometimes even "jokingly" entertains the idea / joins in. It's some up-and-down, where one moment she seems open and the next she pulls back and says she doesn't want it.

Now, her girl-best-friend is a total slut (especially in contrast to her), but she lives on the other side of the country now. Recently my LTR announced that she would soon invite this girlfriend to our city to hang out with us for a few days. She said that this way "I could finally get to know her". This girl has a habit of quickly falling in love with a new guy like every month or so, and I said "what if I'm her next great love?" to which my LTR replied "I wouldn't be surprised" and laughed. I teased her by asking a few questions about certain aspects of her appearance because I've only seen one or two pics of just her face so far, which she answered without hesitation. She later also brought up, without me saying anything towards that, that she could maybe get her friend to send us a sexy photo or something.

Now, maybe I'm autistic, but it's almost to overt to be real. One time she says she doesn't ever wanna share me, and the next day she announces she'll invite her slutty friend halfway across the country to us, describes her ass and tits to me, and implies that girl will probably want to fuck me. On the other hand, it's possible that she secretly waited to be "pressured" into doing this with me, because a) when we were just casually dating she brought up the idea once to invite a hooker for a threesome, which I didn't pursue then (and later she didn't agree anymore because "now we're in a relationship so it's different"), and b) she made out with multiple girls in her life.

Is this too good to be true, or does this sound legit? And if it's legit and not a trick or something, how exactly do I play this once the girl is here and the three of us hang out?