Leo · Leo
Two suns, one room, and nobody willing to be the moon.
Two Leo Suns are warm, generous, loyal and entirely unwilling to be the supporting character. Nobody here is dimming for anybody. Whether that is magnificent or unbearable depends on one thing: whether they perform for each other or at each other.
What pulls
Generosity, met in kind, which almost never happens to either of them. Leo gives extravagantly and is usually the one who gives more; here, for once, it comes back at the same voltage. There is also no small talk about whether the relationship is serious. Leo does not do lukewarm and neither does the other one, and both of them know it by the second week.
Where it grinds
Attention. Not from strangers, from each other. Leo needs to be the one the story is about, and when the story is about the other person for too long, something in Leo starts competing without ever admitting that is what it is doing. It shows up as topping the anecdote, or going quiet in a way that is loud. Both of them will insist they are above this. Neither of them is.
The long version
This is one of the pairings most improved by simply naming it. Two Leos who can say out loud that they both want the room, and then deliberately give it to each other in turn, are formidable and very hard to bore. Two who cannot are running a slow contest for applause. Nothing in a Sun sign decides which. The Moons very often do.