Bug report: I wound up doing the runedust sidequest and finding rose/lily before going to the Inn to meet Erika, and after the sex scene the door to her room is locked and I can't leave.
Oh wow, if this is true I'm surprised nobody else has found this. If I can replicate this today I'll make a hotfix out of it. Meanwhile it's best to play the game in the intended order of joining the agency -> spend a night with Erika/Quinn -> get a quest from Erika to find Rose & Lily.
