Now I've bumped into a rather juicy situation as a DM. See, one of my players wants to make a pact with a demon. Reason? She is bound by a secrecy sigil, a tattoo that prevents her from speaking about a specific (very VERY) important topic. I have established in this homebrew world that demons can shatter these sigils.

So now I get to play the part of a cunning demon who wants to trick her into agreeing to something very favorable for said demon. I've got some ideas on the nature of the pact, but I'd like to hear the community's ideas on the topic. How would YOU handle this situation, what terms should the demon go for, and what "tricks" would you try to pull off? My campaign is Pathfinder, though I can see how this could leak into other editions.