I really don't know how finish quest Sick People. I defeat 4 hydrageas and still nothing. Also how activate H scene from this quest?
To be absolutely clear, have you defeated 4 hydrangeas in various different places, or did you defeat the correct hydrangeas in the correct place?
Go to Riverflow and exit west (left) to a map with bunch of wolves.
At the end there's a couple of Hydrangeas to fight, have them lower your willpower enough times to trigger the pink version of the h-scene that occurs afterwards before killing them.