PARENTAL LOVE!
The game takes place 16 years after you were separated from your wife and 2 daughters due to your drug addiction. You got yourself cleaned up and somehow your hot as hell wife is still single and in love with you, so you are rekindling things, however, the moment you first see your eldest daughter you immediately notice her gorgeous ass.
This game is in the same style as dating my daughter but with the numerous characters and the fact that the Dev understands sex should serve the plot and not as a reward, it has more sex than DmD in spite of only being a .5
Beyond this, most of the games I can think of are a single father or one currently going through a divorce.
You might like My Sweet Neighbors though, you're dating your hot Milf neighbor and eventually her daughter as well. It's a sweet game, though not as taboo as parental love it's still good.