Sorry Berrygirl, only teasing!
But I meant what I said, that these things have a certain elastic quality, and as a relationship grows, it is possible to gently stretch the bounds of spontaneity without causing too much discomfort for the Aspie partner. It's a step at a time, maybe half a step, but we pair of Aspies are more spontaneous than we were when we first got together, but we'd both admit to treading on each other's toes a few times along the way. There is nothing magical about this: two NTs will engage in the same process, just maybe in a less thought-out way.
Maybe for an NT with an Aspie partner the insight lies in realising that what is a half step for an NT feels like two steps for the Aspie. The NT needs to be empathic in realising this, patient when their needs from the relationship seem to run ahead of those of the Aspie, and hopeful, because you can 'get there' in the end if both are committed to each others' happiness!