Familiarity

From InquisitionWiki

As you roleplay with someone, the game tracks how much RPxp you have earned with them. Until you have earned 5000 xp with them, your RPxp rank will be adjusted upward two notches while that person is in the room. Once you have earned 5000, the adjustment is 1. After 10000 RPxp, there is no bonus for roleplaying with that person (there are no negatives, either). The system uses the person with the least familiarity in the room as its basis.