Two Dragon/Leo? Brace yourself for a 95–100% throne war disguised as a relationship. The DoubleSign zodiac's most regal personality has met its mirror, and there's only room for one king in the kingdom. Either you split the throne or somebody abdicates, usually loudly.
Chemistry is incandescent. Two Dragon/Leo halves crave the same things, adoration, command, spectacle, and find them all in each other. The bedroom is competitive in the best and worst senses. Each of you wants to be the one being protected, which means somebody has to take turns being the dragon and being the cargo.
Conversation is loud, opinionated, and frequently a coronation speech. Both Dragon/Leo halves declare more than they discuss. Listening is technically possible. It just doesn't happen often. Charm school remains the canon's prescription, and neither of you has enrolled.
Friction is the throne. Two indomitable wills, two unstoppable Lion mights, one couch. Dragon/Leo cannot stand losing to Dragon/Leo. The reconnaissance step gets skipped, claws come out, and somebody pulls back a bloody stump. Apologies are rare and grudging.
What each Dragon/Leo needs from the other is the lesson the canon already gave: be protective, but don't impress upon them the necessity to feel obligated. Share the protection, share the spotlight, share the throne. Taking over the known world requires a co-monarch you don't try to outshine.
At 95–100%, this is a top-of-the-zodiac match, and a high-stakes one. Two Dragon/Leo either rule together magnificently or destroy each other ceremoniously. Pick a co-throne, not a duel.