Castle Infection v1.00 + Save by Angry_Whale Win/Android - Adult Sex Game

Sharvia, a succubus, is commissioned by a group of humans to purify the castle.
The humans believe that Sharvia is the only one who can do it.
She agrees to help them, and she sets out on her journey, though things don't appear what they are seen to be.
Could the people have their own agenda...