I dunno about marriage but here are the games where you can have children:
- When life give you lemons [WIP]. There are options where you can choose one of the ROs to be the other biological parent (your boss or your ex). There's spicy scenes.
- Never date werewolves [Completed]. This is a HoC game with 2 spicy label. But keep in mind, the game is gender lock female protagonist. I have never played the game so I don't know if the game is good or not.
- Myrk Mire [WIP].
- There is option where you have children in Thicker than [WIP]... But it's rather angsty... There's also spicy scenes.