When I go to do an intimate action or ask for Arane or Akira to undress they say that they are not in the mood, how do I get them to get into the mood? When I tried to talk to them they still did not want to do anything.
The Intimate actions require you to manage their Lust stat. The same works for the random NPCs, you use the Kiss intimate action to raise their Lust.
However, I gotta say I'm still working on the main characters' post-main story mechanics so there may not be a way to raise their Lust yet, my bad.
I've added this to my high priority list.