Another step forward. Another. Madison's breath was hot in my ear. Her body incredible in my arms. Yet, despite the feeling of inevitable release, I wasn't worried.

See, I was convinced that once we got to the escalator, we'd be OK. A short ride where we wouldn't be moving (at least, not under our own power) seemed like it would be safe. Without the jostle, the bump and grind, I thought our bodies would calm.

I was wrong.

In the end, I don't know what caused it. Maybe the vibration of the steps as they rumbled upwards gave my sister the right stimulation. Or perhaps it was all the faces...