It feels easy, like you already know how to be around each other. The risk is you stop choosing it.
The two of you
Pisces. You feel real when you do not have to harden yet. People see the softness, and someone who understands before the explanation.
Cancer. You feel real when the room is safe. People see the care. They come to you when something hurts.
What wears it out
A demand to be definite before you are ready drains you. So does a hard room with nowhere to retreat.
A cold room drains you. So does having to pretend you do not mind.
Pisces feels it first and explains later and adapts quickly, and may not finish. Cancer feels it first and explains later and starts things.
Wanting each other is not the hard part. Staying awake to each other is. Comfort can turn into taking the warmth for granted. Together, it shows up as romance, play, and being admired. The other way around, it shows up as the bigger plan, farther away.
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.