Good girl gone bad is great game, Great story, scenes and amazing CG's
And doesn't at all fit what he's asking for.
I do apologise as there aren't many 2D games I've played. I've heard of a few that might suit you, but if they do they're popular enough that others will recommend them.
What you want are games that are more in the life sim category.
View of Family, is probably the best of this, it has a natural progression with each family character that leads up to the sex.
Chloe18 fits this in some instances and doesn't in others. Pretty much, most of the time, chloe doesn't go all out with a person on their first encounter, and so things will progress in a similar fashion.
You may enjoy RogueLike, though the game does at times expect a familiarity with X-men Evolution Lore. However getting both Rogue and Kitty into bed requires work.
Then there are a few VN that also follow a similar progression
Parental Love, this game hasn't even gotten to penetration yet, but the stairway model has been used starting with kisses and heavy petting
My Sweet Neighbors also seems to be taking the slow and steady approach. You've had intercourse with one of the women at the story's current end point but not the other who's relations with you are only just beginning.
Teacher's Pets, if you play the non drug version *I haven't played the drug line* has such a progression at least with the two I've interacted with.
Dreams of Desire follows a slow progression in spite of being a mind control game, it seems you're not strong enough to get them to both overlook incest and fuck you with abandon.
To be honest, there are definitely more I'd like to share that look like they're going to follow this model, but because they haven't gotten far enough yet I can't say for certain that they will. So, you might check out Babysitter, Intimate Relations, Sisterly Lust, Blooming Love, and A Perverted Family.
Family Values does start slow with the two younger daughters, but puts your dick in the older daughter fast. Still a good game.
Then there are the popular games that really suck because they're poorly written but also fit the ask. Big Brother, Man of The House, Dating my Daughter.