What made it THEE best you ever had?

Although I remember the night I first made my wife cum very clearly, I don't really think of it as THEE best. Probably the best was one night we were experimenting with different positions and found one that just worked. We both came at the same time - something that is incredibly difficult to time out. I think the thing that made it the best was how fluid and unplanned it all was. It was incredibly hot and erotic without being planned or trying all night to work it out just so. We've had a lot of great nights but usually for either myself or her when one of us usually gives more than receives. I'll always remember that one as one of the greats because we both loved it.