Do not wait for a lightning bolt. If you want this, you build it.
The two of you
Scorpio. You feel real when it is honest, even if it is heavy. People see the intensity. They trust you with the thing they will not say elsewhere.
Sagittarius. You feel real when the horizon is still open. People see the range, and the person who makes a bigger story believable.
What wears it out
Small talk that asks you to be fine drains you. So does a secret kept from you.
A small life with the door shut drains you. So does being managed for your own good.
Scorpio feels it first and explains later and does not like to be moved once settled. Sagittarius runs hot and wants it now and adapts quickly, and may not finish.
The signs sit next to each other. The feeling is friendly more than fated. That can still be a good love. It just will not carry you. Together, it shows up as money and what they keep. The other way around, it shows up as what they do not say.
This is the answer people want before anyone knows a birth time. Two real people have more than a sun sign. If it matters, cast both charts.