Rooster/Scorpio and Rat/Sagittarius meet at 65-70%, intensity introduced to candor. The Rooster whose overflowing heart tends to spook people encounters a Rat who prefers everything on the table anyway, and finds that refreshing rather than alarming.
Rat/Sagittarius plays its cards face up and takes a powder at the first hidden agenda; Rooster/Scorpio, whatever its faults, hides nothing about what it wants. That honesty is the bond. The catch is dosage: the Rat's wary, itchy-footed heart commits slowly, and the Rooster wants everything now.
Both are blunt, which saves years. Rat/Sagittarius negotiates cards-on-the-table in candid Sagittarius style; Rooster/Scorpio declares with Scorpio-born force. Arguments are loud but short, since neither one sulks in code. The Rat jokes; the Rooster eventually laughs.
Friction lives in pressure. Rooster/Scorpio's insatiable drive wants the perfect partner secured yesterday; Rat/Sagittarius, wary of permanent attachments and prone to itchy feet, feels the walls of domesticity closing in and is tempted to make a break for it.
Rooster/Scorpio learns to tone the intensity down a notch or two, because this is one partner worth not scaring off. Rat/Sagittarius learns that some attachments reward the risk, and that late to the altar is not the same as never.
At 65-70%, Rooster/Scorpio and Rat/Sagittarius are workable with effort. Total honesty comes standard; the negotiation is speed, one heart sprinting and one strolling.