Well, I go by real responses and opinions coming from the real source and not other people's opinions which mean nothing, and the comments they make about each other under their Gemini and Aquarius compatibility youtube videos are not good. You only see a couple of the usual my husband and I have been together for such and such years comments then all the rest are mostly Aquarius saying they're too childish and irritating for them. And both Gemini and Aquarius saying it's hard for Gemini to even say the words I love you. All of the comments from both are very detached and cold sounding. Not a whole lot of emotion with these two even when they speak about each other. I would see this being better off as friends than lovers unless you both have less airy planets in your chart.
As lovers they're better with Fire, Water, Virgo or Libra. Even though Libra is an air sign, they are very romantic and passionate at the same time because of their Venus, both being very social and charming with the added spice. Think Kim and Kanye, Blake Shelton and Gwen Stefani, G-Eazy and Halsey. You see this couple a lot. With Aquarius, try yourself and see, it really depends on your whole chart if Aquarius will work as lovers. But just going off of their energy, I feel like Aquarius man and Gemini woman would probably connect a little more romantically than Gemini man and Aquarius woman.