You are now master of the house, that you can't leave for some reasons (actual story in the game intro). But you can control specially hired stuff by the device called "proxy", so you can experience many things outside through them. You also needed large amount of money, so decide to try using workers in the "adult entertainment industry". This is can be some challenge, as they not slaves, and can leave work if they feel bad about it. And source of bad mood can be shame, tiredness, loss of fights...

Basically you need to train you contractors mentally, to "relax" them about sex things, and some works or possibilities needed certain physical conditions. Game engine can support physical changes in characters, legacy traits in their genetic, transformations. Also, it's have mechanic to track changes in passing time. So, such thing as growth, timed effects, etc, easily handled by engine.