I have my own motive for wanting the cabin to be 4 - 6 hours away from where they now live.
I'm hoping that this is the story device that prompts Amber and the MC to have to overnight together following the cabin visit.
Amber will be there for the MC and any emotional aftershocks from the visit/recollections And - I'm hoping - some of Amber's unconventional therapy, like roleplaying as Summer to help the MC resolve not getting to say goodbye to Summer, will be involved. This will be part of the events at the cabin before they are forced to overnight away from everyone else.
I'm also hoping that the night together leads to Amber comforting the MC, first as Summer, then when the MC wakes from his bad dream scape, we get Amber path points/choices - continue making out with/fondling Amber or stop.
He does not have to call her Amber but, continued intimacy and the desired physical response from the MC will help Amber know that her therapy is working before she brings it to a stop (Amber path) or the MC does (non-Amber path), for example.
Later, she may reflect (and ask him in the next therapy session) at what point in their intimacy did he realize that Summer was not there, and Amber was (more Amber path points/choices for honesty), and why did he choose to continue?
This question won't be to embarrass the MC but to help him understand that he was driven by a partially awakened libido and his body was responding to the stimulus of being with Amber, as she intended - so no guilt over actions taken - it's all in the name of healing...
That discussion could lead to Amber continuing her unconventional therapy in her office - physical intimacy (making out and fondling each other in the beginning) with the MC to ensure he continues to rise to the occasion.
How long this therapy goes on with Amber's personal help, and how far they take that intimacy could make for a nice slow burn into the Amber LI relationship.
If the cabin is only two hours away, for example, for the version of the cabin visit I laid out above to occur, then we must have bad weather and/or car troubles drive Amber and the MC to seek shelter - overnight.
It still works but a 4-6 hour car drive allows, IMO, more bonding between the MC and Amber and forces the overnight for safety after an emotionally and likely physically exhausting visit to the cabin.
Anyway - so ends my latest speculation/desires about the upcoming cabin visit!
Cheers!!
