I'm playing the Lore character in Alucard's game and my somewhat brief stint of using Flowing Mind Prana since I've only recently got it was a couple of points I hope help you at least a bit.

A) Flowing Mind Prana can only give your* intimacies to the student character until you get the essence 3 charm Legendary Scholar’s Curriculum, then that limitation is gone.

B) Believe it or not my group didn't do much RP for FMP, I ended up just using it in the downtime between stories. Just to tell you it doesn't NEED heavy RP. But it certainly makes it more flavorful. ...