The movements of a ship travelling on water and not within the void of space is soothing to him. It reminds him of the nano-second of complete gravity loss one gets right before the ignition of a cruiser's reactor.
With his arms around Midvalley, Jazz returns the kiss on his cheek like a cat being petted by a favourite can-opener. Complete trust and devotion is in it as well.
The swaying is slow and easy, relaxing even if one is inclined to it.