The feeling is uneven. It lasts if you keep adjusting, not if you wait to match.
The two of you
Cancer. You feel real when the room is safe. People see the care. They come to you when something hurts.
Aquarius. You feel real when you are allowed to be slightly apart. People see the difference, and the idea that arrived before the room was ready.
What wears it out
A cold room drains you. So does having to pretend you do not mind.
A room that wants you normal drains you. So does closeness that asks you to merge.
Cancer feels it first and explains later and starts things. Aquarius needs to talk before it feels real and does not like to be moved once settled.
Nothing in the two signs locks on its own. Some days you understand each other. Some days you are solving different problems in the same room. Together, it shows up as sex and what they cannot take lightly. The other way around, it shows up as the work of an ordinary day.
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.