How these two meet
In a room with other people in it Gemini stops being audible, and it has taken you both years to notice that this happens at all.
It is not that Leo talks over anybody. Leo does not have to. Leo occupies the centre without effort and the room orients itself, and Gemini, who is faster and funnier and has three better versions of the thing, ends up doing the commentary from the side.
Mercury never stands more than 27.8 degrees from the Sun. That is why it is the hardest of the classical planets to see: it only ever appears in twilight, close to the glare, and it is never visible at all while the Sun is up. Not dimmer. Not there.
And the conversation about it never starts, because neither of you can start it. Between a fixed sign and a mutable one there is no cardinal modality in this house at all. Leo holds and Gemini adapts, and the thing that opens a subject is simply not present.
For Gemini, the work is saying the thing at full volume in the room, once, and not converting it into a joke when it lands flat.
For Leo, the work is being audibly wrong about something in front of other people, so that the centre is briefly empty.
And a third: neither of you is going to open this. Somebody has to, and it is going to be graceless when they do.
The question
What are you each waiting to be given permission for?
One conscious action
one room, decentred
Next time there are other people there, Leo asks Gemini a question and then stops talking for as long as it takes.
Gemini answers it in full, without speeding up, and without handing the room back at the end.
Mercury is not a faint object. It is a bright one that is never seen, because of where it has to stand.
Nobody has done anything wrong here and none of it is fair, and those two things are going to have to be true at the same time.