Same, I haven't seen any new scenes from Rinny, I thought all you needed was to be 100% on Lust.
But nothing has happened so far...
If anyone finds out how please do tell.
Nope, having Lust be 100% isn't the only thing. Being a distracting pest and then succumbing to Rinny's hypnosis has a small chance of giving you what you need.
When that's done, remember that Rinny can be a follower in Transylvania. Maybe read or attend a class or few while you have that motivation buff-- absolute godsend after putting off grinding Insight for so long.