It will go up and down or down and up. Guaranteed. Sounds a bit like some lap dances doesn't it?
No one ever asks for a lap dance forecast though. What would your lap dance forecast be? Heavy grinding and overcast with a chance of clothes blocking the action?
Heavy wanna dance dodging before periods of "yes", and then brief downpours of blowjobs over pants finishing with scissor grinding of clit on my shaft before thunderous roars. Then calm.