I'm somewhat reluctant to call it milking because there are non-Haley content in the game. It's just that everyone else is so uninteresting that I can't be bothered trying to like them.
To be honest, I am far more worried about the storytelling and the writing. Life with Mary started off interesting but then gone down so fast to a disappointing ending because the story quickly becoming boring. I'm starting to feel that Haley's Story might also go down into the same path. The relationship started off really well with the slow burn, but then it became very formulaic for many episodes (each update ending in bed where they took one very small step further) and suddenly now it's BAM bare-ass daddy spanking, topless sleeping, and bathtub fingering all in one update.
I'm extremely worried that the devs ran out of ideas on how to progress the relationship (see how the dialogue between MC and Haley are pretty much the same "we shouldn't do this" or "it's up to you" again and again for so long) that they just use the nudity/sex scene to fill things up.