XD
Maybe try taking notes from some Hentai. The descriptions are used excite the mind as to trigger a more erotic reaction. So extending the sex by dialogue is a great way to extend game time And the more excited the play is the faster they gain an addiction to the experience.
The mute girl is actually my favourite, but I do have a thing for girls in their underwear wiggling their butts at me asking to be spanked. Such good girls they are.
If possible I would also like to see changes to Fara's affection scenes, forcing a girl that lives to work to sit down and take breaks normally annoys them more than makes them like you. Maybe in an update and after lvl 5 or 10, the MC instead starts giving her massages or draws her a bath.
Having the gathering skill could Maybe allow to go flower picking in town with Rebecca and not sitting awkwardly around.
Just some ideas.