Help - reverse engineering challenge

Challenge for you expert scripters… The Onyx+ has a built-in pattern they call “Storm.”

It starts basic, then finishes with an incredible frenulum-vibrating action that I haven’t seen in any other script, ever. Anyone know how to replicate via script?

This is the official Kiiroo description:
Storm – pattern which slowly massages up and down the cock before suddenly providing all-over stimulation

The description reminds me of this script by Lucifie.
https://discuss.eroscripts.com/t/sequence-inverted/12330