I think all this stuff about external agents (while relevant, technically) is a distraction from the main point: that when you say "Your character is inspired by my character" you are hijacking my right to roleplay my character, not just in terms of physical action (e.g. as a Hold Person spell, or Grappling him might do), but his very thoughts and emotions. It is categorically no different from saying, "Your character is in love with my character."
Sorry, but I will never support the inclusion of a class that even has that ability, let alone on one whose core concept is based on such an ability.