This is very dark. A healing fic.
Emma has been sexually abused when she was younger to the point to where she was conditioned aka brain washed. Emma thinks that the appropriate way to communicate familial love is to have sex because that is what she has been taught.
After the curse breaks, Emma tries to show Charming that she cares by trying to have sex with him. Charming doesn't know what to do especially when saying no is hurting Emma. When he says no, Emma runs to a place she feels safe, the Mayer's house, specifically up in Regina's apple tree.
Henry is confused as to why Emma feels safe with The Evil Queen. He doesn't understand. And neither do her parents or the towns people.
But Regina understands.