Futures Pick up lines

So the obvious answer is yes, I do. But here's the back story: Back in August, I slid into this girl's DMs. We exchanged a couple playful messages and that was that. I hit her back up again in September just to keep things warm. Then in October I asked, "are you almost ready?" She said, "for what?" I said, "our coffee date." She replied, "I might be ready by December lmao." She could've said that because maybe she had shit going on at the time or if she wasn't interested maybe think I'd forget about her by then. Well, I almost did lol and then I remembered today so I hit her up and said, "Since I'm nice I gave you a little extra time. You ready now?" However, she replied with "wanna have a threemsome with my future gf?" Keep in mind, we hadn't talked since October and it was about a coffee date, we don't follow each other and this was her reply. Now 9 times outta 10 if a girl asked this I'd suspect it to be some simp test or her being bored and just fucking with me with no intention of actually...fucking with me. But right when she sent this message she also looked at my profile and liked a recent (shirtless) photo of me which I don't think a girl with zero interest would do. But at the same time even girls with interest don't straight up ask if you wanna have sex, let alone a threemsome with a "future" gf? Futures gf? Which that's a whole other mindfuck. So I guess the question is, how do I respond with being open to it if it's the 1 out of 10 times she's serious about it, but also not come across as a needy simp to the effect of "omg I would love to!"

Because I \[redacted\] if the \[redacted\] Latvian prime minister \[redacted\] perfect predictions of the trajectory of pork belly futures because \[redacted\] federal reserve \[redacted\] which Kanye wasn't willing to do.