This game is amazing. I just beat it, and loved it all.
In order to make this comment constructive, here's what I would do to make the already existing parts event better:
I noticed in the 0.8.2 version that colors and stars were added to the girls traits, yellow color and stars appearing when the trait was acquired. I also saw that continuing to "work on" the trait could put additional stars on them, up to a maximum of 3 on each side of it, but with no additional effect (apparently).
So, to make the existing game even better (in my opinion), would be to make slight changes to the related scenes (I know this might represent a lot of work though).
An example (WARNING: Spoilers to come below !!):
Take the Autumn blowjob scene, in we wish to choose the "inside" ending:
Trait not acquired: She doesn't accept it, tells you before and the option is not showed.
Trait acquired (1 star): She doesn't tell she wouldn't accept and the option shows. Animation stays as it is today (she spits)
Trait acquired (2 stars): Same as for 1 star, except that she swallows now.
Trait acquired (3 stars): Same as for 2 stars, except that before swallowing she shows the inside of her mouth to the player.
I realize such changes for ALL the scenes might take much time and work, but I think it would motivate the players to continue training the girls even more just to see what could happen next.
Anyway, an enormous thank and applause to Runey for this great game.